Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision for income taxes:
Federal									$ 67,253	$ 43,706	$ 34,314
State									10,529	5,500	4,493
Foreign									2,016	1,588	3,306
Total current									79,798	50,794	42,113
Deferred tax benefit:
Federal									(18,579)	(23,896)	(7,105)
State									(3,564)	(2,300)	230
Foreign									381	309	(580)
Total deferred									(21,762)	(25,887)	(7,455)
Total provision for income taxes	$ 18,354	$ 11,668	$ 13,938	$ 14,076	$ 4,618	$ 1,867	$ 8,448	$ 9,974	$ 58,036	$ 24,907	$ 34,658