STOCK-BASED COMPENSATION (Summary of stock-based compensation expense) (Details) - USD ($) $ in Thousands  | 
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021  | 
Jun. 30, 2020  | 
Jun. 30, 2021  | 
Jun. 30, 2020  | 
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| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based Payment Arrangement, Expense | $ 12,830 | $ 38,538 | $ 52,847 | $ 50,270 | 
| Selling, General and Administrative Expenses [Member] | ||||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based Payment Arrangement, Expense | 3,736 | 30,249 | 31,810 | 35,212 | 
| Corporate Expense [Member] | ||||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Share-based Payment Arrangement, Expense | $ 9,094 | $ 8,289 | $ 21,037 | $ 15,058 | 
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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