Income Taxes Components of Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal									$ 33,814	$ 24,607	$ 24,956
Foreign									10,513	11,982	6,007
State and Local									10,114	7,541	7,912
Total Current									54,441	44,130	38,875
Deferred:
Federal									15,104	5,992	(2,458)
Foreign									(3,080)	4,733	(4,756)
State and Local									2,291	8,834	(753)
Total Deferred									14,315	19,559	(7,967)
Total	$ 30,542	$ 15,264	$ 15,387	$ 7,563	$ 26,474	$ 12,350	$ 17,130	$ 7,735	$ 68,756	$ 63,689	$ 30,908