Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Reconciliation of Income Tax from Statutory Rates to Income Tax Expense (Benefit)) (Details)

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INCOME TAXES (Reconciliation of Income Tax from Statutory Rates to Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
United States statutory income tax rates   21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax expense (benefit) at United States statutory rates (21%, 35% and 35%, respectively)   $ 27,532 $ (3,283) $ 16,914
State income taxes, net of federal tax benefits   4,860 1,544 3,264
Differences between foreign and United States statutory rates   2,650 (10,887) (11,116)
United States tax reform rate change $ (55,700) 0 (55,685) 0
Non-United States income inclusions and exclusions   (3,425) 3,826 (2,749)
United States income inclusions and exclusions   (13,790) 11,347 (1,317)
Nondeductible items   26,376 11,380 3,210
Tax contingencies   389 1,955 2,390
Tax expense from acquired goodwill   4,353 4,489 5,936
Change in valuation allowance   (8,845) 18,067 11,820
Other, net   665 93 (323)
Income tax expense (benefit)   $ 40,765 $ (17,154) $ 28,029