Income Taxes (Details 1)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax rate	35.00%	35.00%	35.00%
State and local taxes net of federal benefit	4.30%	3.90%	3.40%
Domestic production deduction	(3.70%)	0.00%	0.00%
Foreign tax rate differential	(0.20%)	(1.40%)	(0.10%)
Permanent differences	2.00%	1.50%	1.90%
Reduction of uncertain tax position liabilities	0.00%	0.00%	(4.50%)
Other	(0.70%)	(0.70%)	0.90%
Effective tax rate	36.70%	38.30%	36.60%