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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 30,171 $ 15,239 $ 71,806 $ 47,884
Other comprehensive income:        
Currency translation adjustment (24,625) 13,337 (2,791) 36,342
Comprehensive income $ 5,546 $ 28,576 $ 69,015 $ 84,226