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Stock-Based Compensation (Summary Of Stock-Based Awards) (Details) (USD $)
In Thousands, except Per Share data
9 Months Ended
Sep. 30, 2011
Restricted Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Nonvested shares outstanding at December 31, 2010178
Granted, Shares195
Vested, Shares(10)
Forfeited, Shares(20)
Nonvested shares outstanding at September 30, 2011343
Nonvested shares outstanding, Weighted-Average Grant Date Fair Value$ 17.17
Granted, Weighted-Average Grant Date Fair Value$ 18.57
Vested, Weighted-Average Grant Date Fair Value$ 17.54
Forfeited, Weighted-Average Grant Date Fair Value$ 17.74
Nonvested shares outstanding, Weighted-Average Grant Date Fair Value$ 17.92
Restricted Stock Units And Phantom Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Nonvested shares outstanding at December 31, 201047
Granted, Shares86
Vested, Shares(9)
Forfeited, Shares(12)
Nonvested shares outstanding at September 30, 2011112
Nonvested shares outstanding, Weighted-Average Grant Date Fair Value$ 17.05
Granted, Weighted-Average Grant Date Fair Value$ 17.77
Vested, Weighted-Average Grant Date Fair Value$ 16.66
Forfeited, Weighted-Average Grant Date Fair Value$ 16.87
Nonvested shares outstanding, Weighted-Average Grant Date Fair Value$ 17.65
Performance Based Restricted Stock Unit [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Granted, Shares93[1]
Nonvested shares outstanding at September 30, 201193
Granted, Weighted-Average Grant Date Fair Value$ 18.57[1]
Nonvested shares outstanding, Weighted-Average Grant Date Fair Value$ 18.57
[1]Represents target number of shares that can vest based on the achievement of certain performance criteria.