Income Taxes (Reconciliation From Statutory Federal Income Tax Rate To Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State tax on commercial operations, net of federal benefits	0.40%	0.20%	0.70%
Impact of international operations	(1.00%)	(2.40%)	(2.30%)
Domestic production deduction	(1.80%)	(1.60%)	(0.80%)
Domestic tax credits	(0.60%)	(0.60%)	(0.60%)
Other, net	(0.60%)	0.10%	(0.50%)
Effective income tax rate	31.40%	30.70%	31.50%