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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 42,655 $ 41,635
Other comprehensive income:    
Currency translation adjustment 5,423 21,834
Comprehensive income $ 48,078 $ 63,469