Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. statutory federal rate applied to pretax income	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit	3.70%	4.00%	3.40%
Foreign tax rate differential	(1.30%)	(0.40%)	(0.40%)
Non-deductible expenses	3.40%	2.40%	2.10%
Change in state tax rate	(0.70%)	1.20%	0.20%
Domestic production activities deduction	(1.60%)	(2.50%)	(1.60%)
Other	(0.10%)	(0.80%)	1.20%
Valuation allowance for deferred tax assets	0.10%	(0.40%)	(0.40%)
Effective income tax rate	38.50%	38.50%	39.50%