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Share-Based Compensation (Stock Option Activity) (Details)
6 Months Ended
Jun. 30, 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 (33,901)
Ending balance, Number of Options | shares 768,748
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 31.00
Ending balance, Weighted Average Exercise Price 31.04
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 7.25
Ending balance, Weighted average grant date fair value $ 7.21
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 (96,058)
Vested, Number of Options | shares 0
Forfeited/expired, Number of Options | shares (33,901)
Ending balance, Number of Options | shares 1,365,947
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 21.81
Vested, Weighted Average Exercise Price 0.00
Forfeited/expired, Weighted Average Exercise Price 31.00
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 597,199
Exercisable/vested, Weighted Average Exercise Price $ 23.84