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COMPREHENSIVE INCOME - Schedule of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Net income $ 11,376 $ 10,835 $ 22,368 $ 17,230
Foreign currency translation adjustment (27,785) 19,484 (14,005) 23,548
Change in unrealized (loss) gain on derivatives, net of tax 4,128 (884) 13,032 (537)
Unrealized (loss) on short-term investments 0 (1,291) 0 0
Pension liability adjustment, net of tax 12 (13) 6 (15)
Comprehensive income, net $ (12,269) $ 28,131 $ 21,401 $ 40,226