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Consolidated Statements of Comprehensive Income (Unaudited) - 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 $ 111,319 $ 105,936 $ 201,409 $ 260,391
Foreign currency translation adjustment (3,364) 4,514 (8,867) 5,887
Other comprehensive (loss) income (3,364) 4,514 (8,867) 5,887
Comprehensive income $ 107,955 $ 110,450 $ 192,542 $ 266,278