Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 32,600	$ 11,812	$ 23,816
State and local	5,677	225	3,492
Foreign	1,409	1,400	757
Total current income tax provision	39,686	13,437	28,065
Deferred:
Federal	19,741	35,147	14,808
State and local	1,830	4,321	1,982
Foreign	244	906	(287)
Total deferred income tax provision	21,815	40,374	16,503
Federal	52,341	46,959	38,624
State and local	7,507	4,546	5,474
Foreign	1,653	2,306	470
Total income tax expense	$ 61,501	$ 53,811	$ 44,568