Income Taxes - Components of the Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 86,437	$ 32,656	$ 1,866
State and local	6,595	3,250	74
Foreign	413	963	263
Total current expense	93,445	36,869	2,203
Deferred:
Federal	11,658	27,870	42,148
State and local	389	1,385	2,032
Total deferred expense (benefit)	12,047	29,255	44,180
Total income tax expense (benefit)	$ 105,492	$ 66,124	$ 46,383