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COMPREHENSIVE INCOME - Schedule of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity [Abstract]    
Net income $ 6,394 $ 13,419
Foreign currency translation adjustment 4,064 11,244
Change in unrealized gain on derivatives, net of tax 347 0
Unrealized gain on short-term investments 1,292 0
Pension liability adjustment, net of tax (2) (7)
Comprehensive income, net $ 12,095 $ 24,656