Income Taxes - Components of the Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 60,079	$ 21,632	$ 85,966
State and local	6,322	6,702	5,389
Foreign	2,034	1,235	2,057
Total current expense	68,435	29,569	93,412
Deferred:
Federal	82,455	149,583	34,240
State and local	3,691	6,031	(122)
Total deferred expense (benefit)	86,146	155,614	34,118
Total income tax expense (benefit)	$ 154,581	$ 185,183	$ 127,530