Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 3,605		$ (308)
State and local	2,793	355	57
Foreign	1,194	1,348	2,022
Total current provision	7,592	1,703	1,771
Deferred
Federal	20,531	14,494	6,763
State and local	2,890	3,170	5,014
Foreign	16	115	399
Total deferred provision	23,437	17,779	12,176
Provision for income taxes	$ 31,029	$ 19,482	$ 13,947