Income Taxes - Provision for Income Tax Schedule (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax provision (benefit):
Federal	$ (29,982)	$ 41,090	$ 89,816
State	8,085	6,336	6,238
Foreign	64,274	51,244	39,952
Deferred tax provision (benefit):
Federal	5,954	(24,136)	6,903
State	701	21,689	(86)
Foreign	(7,140)	(4,367)	3,599
Change in valuation allowance	2,824	(430)	(787)
Total	$ 44,716	$ 91,426	$ 145,635