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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
plan
Dec. 31, 2012
Principal Owner
Minimum
Dec. 31, 2012
NonPrincipal Owner
Dec. 31, 2012
Long-Term Incentive Compensation Plan 2007
Dec. 31, 2012
Directors’ Incentive Plan 2007
Dec. 31, 2010
Stock Options
Dec. 31, 2012
Stock Options
Principal Owner
Dec. 31, 2012
Stock Options
NonPrincipal Owner
Maximum
Dec. 31, 2012
Restricted Stock
Employee
Dec. 31, 2012
Restricted Stock
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of equity compensation plans 3                  
Number of equity compensation plans available for future grants 2                  
Number of shares reserved for issuance under equity compensation plans       2,400,000 250,000          
Stock options, exercise price as percent of weighted-average grant date fair value   110.00% 100.00%              
Stock options, expiration period             5 years 10 years    
Award vesting period                 4 years 1 year
Unrecognized compensation cost related to share-based payments $ 1.4                  
Unrecognized compensation cost related to share-based payments, period for recognition 3 years                  
Repurchase of common stock, settlement of tax withholding for stock option exercises           $ 1.9