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COMPREHENSIVE INCOME - Schedule of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Net income $ 10,835 $ 12,755 $ 17,230 $ 26,173
Foreign currency translation adjustment 19,484 (6,569) 23,548 4,675
Change in unrealized gain on derivatives, net of tax (884) (345) (537) (345)
Unrealized gain on short-term investments (1,291) 0 0 0
Pension liability adjustment, net of tax (13) 3 (15) (4)
Comprehensive income, net $ 28,131 $ 5,844 $ 40,226 $ 30,499