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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 90,090 $ 154,455
Foreign currency translation adjustment (5,503) 1,373
Other comprehensive (loss) income (5,503) 1,373
Comprehensive income $ 84,587 $ 155,828