Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 789,340	$ 46,535	$ 811,523	$ 104,278
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment during the period	1,836	(212)	3,491	1,060
Other comprehensive income (loss)	1,836	(212)	3,491	1,060
Comprehensive income	$ 791,176	$ 46,323	$ 815,014	$ 105,338