Income Taxes (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Difference between the Company's reported provision for income taxes and the U.S. federal statutory rate
U.S. federal tax at statutory rate	35.00%	35.00%	35.00%
State and local taxes - net of federal benefit	2.40%	5.20%	4.60%
Release of previously unrecognized tax benefits	(7.80%)
Other, net	1.10%	(0.80%)	(1.40%)
Provision for income taxes	30.70%	39.40%	38.30%