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Share-Based Compensation (Stock Option Activity) (Details)
3 Months Ended
Mar. 31, 2016
$ / shares
shares
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 $ 6.15
Stock Options [Member] | Non Vested [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Number of Options | shares 479,755
Granted, Number of Options | shares 441,167
Exercised, Number of Options | shares 0
Vested, Number of Options | shares (118,273)
Forfeited/expired, Number of Options | shares (8,783)
Ending balance, Number of Options | shares 793,866
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance, Weighted Average Exercise Price $ 28.75
Granted, Weighted Average Exercise Price 32.81
Exercised, Weighted Average Exercise Price 0.00
Vested, Weighted Average Exercise Price 28.30
Forfeited/expired, Weighted Average Exercise Price 32.21
Ending balance, Weighted Average Exercise Price 31.03
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 8.49
Weighted average fair value of options granted 6.15
Exercised, Weighted Average Grant Date Fair Value 0.00
Vested, Weighted Average Grant Date Fair Value 8.40
Forfeited/expired, Weighted Average Grant Date Fair Value 6.66
Ending balance, Weighted average grant date fair value $ 7.22
Stock Options [Member] | Vested & Nonvested [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Number of Options | shares 1,054,739
Granted, Number of Options | shares 441,167
Exercised, Number of Options | shares (70,885)
Vested, Number of Options | shares 0
Forfeited/expired, Number of Options | shares (8,783)
Ending balance, Number of Options | shares 1,416,238
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Beginning balance, Weighted Average Exercise Price $ 25.38
Granted, Weighted Average Exercise Price 32.81
Exercised, Weighted Average Exercise Price 20.69
Vested, Weighted Average Exercise Price 0.00
Forfeited/expired, Weighted Average Exercise Price 32.21
Ending balance, Weighted Average Exercise Price $ 27.89
Stock Options [Member] | Vested [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]  
Exercisable/vested, Number of Options | shares 622,372
Exercisable/vested, Weighted Average Exercise Price $ 23.88