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Share-Based Compensation (Stock Option Activity) (Details) (USD $)
6 Months Ended
Jun. 30, 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 419,991
Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Ending balance, Number of Options 1,218,487
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 (126,682)
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 $ 22.96
Forfeited/expired, Weighted Average Exercise Price $ 23.43
Ending balance, Weighted Average Exercise Price $ 24.27
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 $ 6.93
Forfeited/expired, Weighted Average Grant Date Fair Value $ 7.00
Ending balance, Weighted average grant date fair value $ 7.19
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 (10,643)
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 $ 21.84
Vested, Weighted Average Exercise Price $ 0.00
Forfeited/expired, Weighted Average Exercise Price $ 23.43
Ending balance, Weighted Average Exercise Price $ 26.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Exercisable/vested, Number of Options 798,496
Exercisable/vested, Weighted Average Exercise Price $ 28.30