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INCOME TAXES - Income before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. $ 82,652 $ (132,000) $ 27,284
Foreign (12,628) (21,633) (4,819)
Earnings (loss) before income taxes $ 70,024 $ (153,633) $ 22,465