Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate, Continuing Operations	7.60%	17.60%	55.50%	(2.40%)
Increase Decrease In Impact Of Certain Receipts Charges	3.60%		(64.80%)
Effective Tax Rate	17.40%	23.80%	15.50%	22.40%
Net Increase Decrease In Effective Tax Rate	(6.40%)		(6.90%)
Increase Decrease In Reported Tax Rate	(10.00%)		57.90%
Impact of certain receipts charges	9.80%	6.20%	(40.00%)	24.80%