Share-Based Awards (Narrative) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Share Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for future issuance under the plan	13.0
Stock Options [Member] | Stock Appreciation Rights (SAR's) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	three
Percentage becoming exercisable after one year	33.00%
Award expiration (years)	10
Stock Options [Member] | Prior To 2010 [Member] | Stock Appreciation Rights (SAR's) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	four
Percentage becoming exercisable after one year	25.00%
Restricted (Nonvested) Stock [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	three
Percentage becoming exercisable after one year	33.00%
Restricted (Nonvested) Stock [Member] | Prior To 2010 [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	2 to 5