Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 21,632	$ 85,966	$ 86,437
State and local	6,702	5,389	6,595
Foreign	1,235	2,057	413
Total current expense	29,569	93,412	93,445
Deferred:
Federal	149,583	34,240	11,658
State and local	6,031	(122)	389
Total deferred expense (benefit)	155,614	34,118	12,047
Total income tax expense (benefit)	$ 185,183	$ 127,530	$ 105,492