INCOME TAXES (Tables)
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12 Months Ended | 
Dec. 31, 2020  | 
| Income Tax Disclosure [Abstract] | 
 
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| Significant Components of the Provision for Income Tax Expense (Benefit) | 
 Significant components of the provision for income tax expense (benefit) are as follows:     
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Year Ended December 31, | 
 
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2020 | 
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2019 | 
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2018 | 
 
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(in thousands) | 
 
| Current: | 
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|   Federal | 
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$ | 
—  | 
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$ | 
—  | 
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$ | 
(55) | 
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|   Foreign | 
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7,978  | 
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61,834  | 
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40,239  | 
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|   State | 
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1,024  | 
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5,523  | 
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6,828  | 
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| Total current | 
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9,002  | 
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67,357  | 
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47,012  | 
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| Deferred: | 
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|   Federal | 
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(16,366) | 
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5,314  | 
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2,246  | 
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|   Foreign | 
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(20,772) | 
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(6,345) | 
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(8,697) | 
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|   State | 
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(739) | 
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566  | 
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204  | 
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| Total deferred | 
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(37,877) | 
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(465) | 
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(6,247) | 
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| Income tax expense (benefit) | 
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$ | 
(28,875) | 
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$ | 
66,892  | 
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$ | 
40,765  | 
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| Significant Components of Deferred Tax Liabilities and Assets | 
 Significant components of our deferred tax liabilities and assets are as follows: 
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December 31, | 
 
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2020 | 
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2019 | 
 
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(in thousands) | 
 
| Deferred tax liabilities: | 
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|           Leases | 
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$ | 
206,701  | 
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$ | 
192,870  | 
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|           Intangible assets | 
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170,517  | 
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161,843  | 
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|           Prepaid expenses | 
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17,786  | 
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5,876  | 
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|           Other | 
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31,835  | 
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19,186  | 
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| Total deferred tax liabilities | 
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426,839  | 
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379,775  | 
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| Deferred tax assets: | 
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|           Intangible assets | 
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38,846  | 
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40,926  | 
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|           Accrued expenses | 
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40,843  | 
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60,479  | 
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|           Net operating loss carryforwards | 
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955,160  | 
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488,081  | 
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|           Foreign tax and other credit carryforwards | 
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51,119  | 
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47,215  | 
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|           Equity compensation | 
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25,209  | 
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22,503  | 
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|           Leases  | 
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224,776  | 
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211,206  | 
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|           Other | 
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34,171  | 
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12,751  | 
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| Total gross deferred tax assets | 
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1,370,124  | 
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883,161  | 
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|           Valuation allowance | 
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1,100,407  | 
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667,242  | 
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| Total net deferred tax assets | 
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269,717  | 
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215,919  | 
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| Net deferred tax liabilities | 
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$ | 
(157,122) | 
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$ | 
(163,856) | 
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| Reconciliation of Income Taxes at the United States Statutory Rate to Income Tax Expense | 
 The reconciliation of income tax computed at the United States federal statutory rates to income tax expense (benefit) is: 
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Year Ended December 31, | 
 
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2020 | 
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2019 | 
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2018 | 
 
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(in thousands) | 
 
Income tax expense (benefit) at United States statutory rate of 21%  | 
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$ | 
(389,900) | 
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$ | 
38,872  | 
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$ | 
27,532  | 
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| State income taxes, net of federal tax benefits | 
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713  | 
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3,137  | 
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4,860  | 
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Differences between foreign and United States statutory rates  | 
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(12,794) | 
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6,384  | 
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2,650  | 
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| Non-United States income inclusions and exclusions | 
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1,809  | 
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(3,222) | 
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(3,425) | 
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| United States income inclusions and exclusions | 
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(16,495) | 
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(2,582) | 
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(13,790) | 
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| Nondeductible items | 
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39,861  | 
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10,118  | 
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26,376  | 
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| Tax contingencies | 
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(1,302) | 
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(1,340) | 
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389  | 
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| Tax expense from acquired goodwill | 
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6,950  | 
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6,107  | 
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4,353  | 
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| Change in valuation allowance | 
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344,161  | 
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8,536  | 
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(8,845) | 
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| Other, net | 
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(1,878) | 
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882  | 
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665  | 
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$ | 
(28,875) | 
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$ | 
66,892  | 
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$ | 
40,765  | 
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| Summary of Activity Related to Unrecognized Tax Benefits | 
 The following table summarizes the activity related to the Company’s unrecognized tax benefits:  
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Year Ended December 31, | 
 
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2020 | 
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2019 | 
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2018 | 
 
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(in thousands) | 
 
| Balance at January 1 | 
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$ | 
21,723  | 
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$ | 
34,071  | 
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$ | 
30,630  | 
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| Additions: | 
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|           Increase for current year positions | 
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1,689  | 
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2,215  | 
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1,531  | 
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|           Increase for prior year positions | 
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—  | 
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1,898  | 
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2,995  | 
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|           Interest and penalties for prior years | 
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352  | 
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458  | 
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106  | 
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| Reductions: | 
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|           Decrease for prior year positions | 
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(2,109) | 
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(3,272) | 
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—  | 
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|           Expiration of applicable statute of limitations | 
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—  | 
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—  | 
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(730) | 
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|           Settlements for prior year positions | 
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(17) | 
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(13,852) | 
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(9) | 
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| Foreign exchange | 
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94  | 
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205  | 
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(452) | 
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| Balance at December 31 | 
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$ | 
21,732  | 
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$ | 
21,723  | 
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$ | 
34,071  | 
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