Income Taxes (Reconciliation Of Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [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	3.40%	3.20%	4.10%
Foreign tax rate differential	0.20%	0.10%	0.10%
Non-deductible expenses	1.70%	2.90%	1.50%
Change in state tax rate	0.20%	(0.80%)	0.50%
Domestic production activities deduction	(0.90%)	(0.10%)
Other	0.00%	0.90%	0.10%
Change in valuation allowance for deferred tax assets	(0.50%)	0.10%	(30.70%)
Effective income tax rate	39.10%	41.30%	10.60%