Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
U.S. federal	$ 106,700	$ 709	$ (194)
U.S. state and local	19,665	4,081	2,902
Non U.S.	958	(828)	3,773
Current income tax expense	127,323	3,962	6,481
Deferred:
U.S. federal	25,221	30,331	(106,996)
U.S. state and local	(16,803)	(10,997)	0
Non U.S.	(4,883)	(543)	(599)
Deferred income tax expense (benefit)	3,535	18,791	(107,595)
Income tax expense (benefit)	$ 130,858	$ 22,753	$ (101,114)