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Share-Based Compensation (Stock Option Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted average per share fair value $ 7.40
Non Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Ending balance, Number of Options 451,098
Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Ending balance, Number of Options 1,223,914
Stock Options [Member] | Non Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Number of Options 314,765
Exercised, Number of Options 0
Vested, Number of Options (95,575)
Forfeited/expired, Number of Options (12,311)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance, Weighted Average Exercise Price $ 23.03
Granted, Weighted Average Exercise Price $ 25.14
Exercised, Weighted Average Exercise Price $ 0.00
Vested, Weighted Average Exercise Price $ 23.93
Forfeited/expired, Weighted Average Exercise Price $ 23.43
Ending balance, Weighted Average Exercise Price $ 23.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Beginning balance, Weighted average grant date fair value $ 6.92
Weighted average per share fair value $ 7.40
Exercised, Weighted Average Grant Date Fair Value $ 0.00
Vested, Weighted Average Grant Date Fair Value $ 7.19
Forfeited/expired, Weighted Average Grant Date Fair Value $ 7.00
Ending balance, Weighted average grant date fair value $ 7.12
Stock Options [Member] | Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Number of Options 997,222
Granted, Number of Options 244,219
Exercised, Number of Options (5,216)
Vested, Number of Options 0
Forfeited/expired, Number of Options (12,311)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance, Weighted Average Exercise Price $ 27.24
Granted, Weighted Average Exercise Price $ 25.14
Exercised, Weighted Average Exercise Price $ 21.70
Vested, Weighted Average Exercise Price $ 0.00
Forfeited/expired, Weighted Average Exercise Price $ 23.43
Ending balance, Weighted Average Exercise Price $ 26.89
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Exercisable/vested, Number of Options 772,816
Exercisable/vested, Weighted Average Exercise Price $ 28.59