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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 62,242 $ 90,090
Foreign currency translation adjustment 3,801 (5,503)
Other comprehensive income (loss) 3,801 (5,503)
Comprehensive income $ 66,043 $ 84,587