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Share-Based Compensation Plan (Stock Option Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted, Weighted Average Grant Date Fair Value Per Share (USD per share) $ 7.40 $ 7.08 $ 6.12
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted, Number of Options 244,719    
Stock Options [Member] | Non-Vested [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Beginning balance, Number of Options 314,765 162,883 126,670
Granted, Number of Options 244,719 229,763 99,172
Exercised, , Number of Options 0 0 0
Vested, Number of Options (127,443) (76,103) (62,959)
Forfeited/expired, Number of Options (17,961) (1,778) 0
Ending balance, Number of Options 414,080 314,765 162,883
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Beginning balance, Weighted Average Exercise Price Per Share (USD per share) $ 23.03 $ 21.27 $ 23.29
Granted, Weighted Average Exercise Price Per Share (USD per share) $ 25.14 $ 23.78 $ 19.95
Exercised, Weighted Average Exercise Price Per Share (USD per share) $ 0.00 $ 0.00 $ 0.00
Vested, Weighted Average Exercise Price Per Share (USD per share) $ 22.94 $ 21.55 $ 23.27
Forfeited/expired, Weighted Average Exercise Price Per Share (USD per share) $ 23.34 $ 21.48 $ 0.00
Ending balance, Weighted Average Exercise Price Per Share (USD per share) $ 24.29 $ 23.03 $ 21.27
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 Per Share (USD per share) $ 6.92 $ 6.55 $ 6.99
Granted, Weighted Average Grant Date Fair Value Per Share (USD per share) $ 7.40 $ 7.08 $ 6.12
Exercised, Granted, Weighted Average Grant Date Fair Value Per Share (USD per share) $ 0.00 $ 0.00 $ 0.00
Vested, Granted, Weighted Average Grant Date Fair Value Per Share (USD per share) $ 6.92 $ 6.63 $ 6.76
Forfeited/expired, Granted, Weighted Average Grant Date Fair Value Per Share (USD per share) $ 6.98 $ 6.62 $ 0.00
Ending balance, Weighted Average Grant Date Fair Value Per Share (USD per share) $ 7.19 $ 6.92 $ 6.55
Stock Options [Member] | Vested [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Beginning balance, Number of Options 997,222 815,119 757,665
Granted, Number of Options 244,719 229,763 99,172
Exercised, , Number of Options (100,145) (1,532) 0
Vested, Number of Options 0 0 0
Forfeited/expired, Number of Options (67,806) (46,128) (41,718)
Ending balance, Number of Options 1,073,990 997,222 815,119
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Beginning balance, Weighted Average Exercise Price Per Share (USD per share) $ 27.24 $ 28.29 $ 29.42
Granted, Weighted Average Exercise Price Per Share (USD per share) $ 25.14 $ 23.78 $ 19.95
Exercised, Weighted Average Exercise Price Per Share (USD per share) $ 22.87 $ 19.97 $ 0.00
Vested, Weighted Average Exercise Price Per Share (USD per share) $ 0.00 $ 0.00 $ 0.00
Forfeited/expired, Weighted Average Exercise Price Per Share (USD per share) $ 32.27 $ 28.78 $ 28.96
Ending balance, Weighted Average Exercise Price Per Share (USD per share) $ 26.84 $ 27.24 $ 28.29
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Options Exercisable, Number Exercisable 659,910    
Exercisable/vested, Weighted Average Exercise Price Per Share (USD per share) $ 28.45