Provision For Income Taxes (Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Provision For Income Taxes [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	2.10%	2.10%	2.30%
Deferred tax related to equity investment			(1.50%)
Tax rate differential on foreign income	(1.00%)	(0.60%)	(0.80%)
Valuation allowance release		(7.30%)	(9.70%)
Tax statute expiration	(5.80%)	(1.70%)	(0.50%)
Change in uncertain tax positions	0.60%	1.40%	0.20%
Other - net	(0.50%)	(1.40%)	(1.30%)
Effective income tax rate	30.40%	27.50%	23.70%