Income Taxes - Summary of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax expense:
Federal	$ (41,418)	$ 154,050	$ 120,541
State	5,875	1,440	6,645
Foreign	64,946	69,359	43,536
Current income tax expense	29,403	224,849	170,722
Deferred income tax (benefit) expense:
Federal	(5,166)	(6,865)	(47,390)
State	(2,863)	2,156	(2,419)
Foreign	(6,059)	(16,926)	(29,222)
Deferred income tax (benefit) expense:	(14,088)	(21,635)	(79,031)
Income tax expense	$ 15,315	$ 203,214	$ 91,691