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Share-Based Compensation (Stock Option Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted average fair value of options granted $ 9.64
Non Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Ending balance, Number of Options 479,392
Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Ending balance, Number of Options 1,204,797
Stock Options [Member] | Non Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Number of Options 414,080
Exercised, Number of Options 0
Vested, Number of Options (117,799)
Forfeited/expired, Number of Options (6,900)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance, Weighted Average Exercise Price $ 24.29
Granted, Weighted Average Exercise Price $ 29.45
Exercised, Weighted Average Exercise Price $ 0.00
Vested, Weighted Average Exercise Price $ 24.32
Forfeited/expired, Weighted Average Exercise Price $ 24.57
Ending balance, Weighted Average Exercise Price $ 26.32
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 $ 7.19
Weighted average fair value of options granted $ 9.64
Exercised, Weighted Average Grant Date Fair Value $ 0.00
Vested, Weighted Average Grant Date Fair Value $ 7.21
Forfeited/expired, Weighted Average Grant Date Fair Value $ 7.26
Ending balance, Weighted average grant date fair value $ 8.16
Stock Options [Member] | Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Number of Options 1,073,990
Granted, Number of Options 190,011
Exercised, Number of Options (50,917)
Vested, Number of Options 0
Forfeited/expired, Number of Options (8,287)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance, Weighted Average Exercise Price $ 26.84
Granted, Weighted Average Exercise Price $ 29.45
Exercised, Weighted Average Exercise Price $ 25.40
Vested, Weighted Average Exercise Price $ 0.00
Forfeited/expired, Weighted Average Exercise Price $ 26.56
Ending balance, Weighted Average Exercise Price $ 27.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Exercisable/vested, Number of Options 725,405
Exercisable/vested, Weighted Average Exercise Price $ 27.98