Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 39,015	$ 22,288	$ 4,848
State and Local	5,603	3,613	828
Foreign	962	1,156	(176)
Total current income tax provision	45,580	27,057	5,500
Deferred:
Federal	5,281	13,558	15,638
State and Local	553	595	1,833
Foreign	(361)	(1,948)	(1,041)
Total deferred income tax provision	5,473	12,205	16,430
Federal	44,296	35,846	20,486
State and Local	6,156	4,208	2,661
Foreign	601	(792)	(1,217)
Total income tax expense	$ 51,053	$ 39,262	$ 21,930