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Share-Based Payment Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Executive shares 800,000
Number of restricted stock awarded (in shares) 70,434
Total unrecognized compensation expense related to unvested and restricted share-based payment arrangements $ 12.7
Recognizable weighted-average period (in years) 2 years 2 months 12 days
Restricted Stock Grants And Long-Term Incentive Compensation Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares of restricted stock vested (in shares) 123,509
Total vesting-date value of shares vested in a period $ 2.3
Minimum [Member] | Restricted Stock Grants And Long-Term Incentive Compensation Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vest over period (in years) 0 years
Maximum [Member] | Restricted Stock Grants And Long-Term Incentive Compensation Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vest over period (in years) 3 years