Stock-Based Incentive Plans Nonvested Restriced Stock (Details) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Nonvested, period start	1,623,000
Granted	1,107,000
Vested	(1,180,000)
Canceled	(45,000)
Nonvested, period end	1,505,000	1,623,000
Nonvested, Weighted Average Grant Date Fair Value, period start	$ 6.85
Restricted Stock, Granted, Weighted Average Grant Date Fair Value	$ 29.24	$ 8.61	$ 3.51
Vested, Weighted Average Grant Date Fair Value	$ 9.36
Canceled, Weighted Average Grant Date Fair Value	$ 17.72
Nonvested, Weighted Average Grant Date Fair Value, period end	$ 21.01	$ 6.85