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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May. 31, 2015
Nov. 30, 2014
Sep. 30, 2014
Aug. 31, 2014
Jul. 31, 2014
May. 31, 2014
Apr. 30, 2014
Nov. 30, 2013
Jun. 30, 2013
May. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                     237,063 145,149      
Weighted Average Exercise Price                              
Options vested, outstanding (in shares)                     248,311        
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                     852,099        
Weighted Average Exercise Price Per Share (in dollars per share)                     $ 20.55        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                     8 years 172 days        
Number of exercisable options (in shares)                     248,311        
Weighted average exercise price per share (in dollars per share)                     $ 23.34        
Unvested activity                              
Nonvested at the beginning of the period (in shares)                     135,353 0      
Granted (in shares)                     237,063 145,149      
Forfeited stock appreciation rights (in shares)                     (57,204) (9,796)      
Nonvested at the end of the period (in shares)                     315,212 135,353 0    
$16.53 - $22.70                              
Weighted Average Exercise Price                              
Options vested, outstanding (in shares)                     121,020        
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                     628,692        
Weighted Average Exercise Price Per Share (in dollars per share)                     $ 18.49        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                     8 years 211 days        
Number of exercisable options (in shares)                     121,020        
Weighted average exercise price per share (in dollars per share)                     $ 21.71        
$23.03 - $26.92                              
Weighted Average Exercise Price                              
Options vested, outstanding (in shares)                     127,291        
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                     223,407        
Weighted Average Exercise Price Per Share (in dollars per share)                     $ 24.97        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                     8 years 87 days        
Number of exercisable options (in shares)                     127,291        
Weighted average exercise price per share (in dollars per share)                     $ 24.89        
Stock Appreciation Rights (SARs)                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                     532,615 450,894      
Fair value assumptions                              
Risk-free interest rate (as a percent) 1.70% 1.78% 2.03% 1.92% 2.00%   1.98% 1.91% 1.41% 1.17%          
Dividend yield (as a percent) 4.96% 4.00% 3.50% 3.27% 3.24%   3.53% 3.13% 3.56% 3.61%          
Expected life 6 years 6 years 6 years 6 years 6 years   6 years 6 years 6 months 6 years 6 months 6 years 6 months          
Volatility (as a percent) 35.80% 38.60% 40.60% 41.20% 41.20%   44.30% 43.80% 44.10% 44.10%          
SAR grant price $ 16.53 $ 20.48     $ 25.27   $ 23.25 $ 26.22 $ 23.03 $ 22.70   $ 23.43     $ 25.11
Fair value of award (in dollars per share) 3.39 5.17 $ 6.72 $ 7.46 7.55   7.25 8.60 7.07 6.86 $ 16.53 $ 25.20      
Number of Shares                              
Outstanding at beginning of period (in shares)                     953,048 961,458 525,287    
Granted (in shares)                     532,615 450,894 923,832    
Exercised (in shares)                       (52,667) (11,037)    
Forfeited (in shares)                     (385,253) (406,637) (476,624)    
Outstanding at end of period (in shares)                     1,100,410 953,048 961,458 525,287  
Weighted Average Exercise Price                              
Outstanding at beginning of period                     $ 23.53 $ 22.20 $ 21.23    
Granted                     16.53 25.20 22.76    
Exercised                       20.21 19.65    
Forfeited/expired                     22.36 22.65 22.28    
Outstanding at end of period                     $ 20.55 $ 23.53 $ 22.20 $ 21.23  
Outstanding - Aggregate Intrinsic Value                     $ 0.0 $ 0.0 $ 5.6 $ 0.0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised                     0.0 0.2 0.1    
Recognized stock-based compensation expense                     $ 1.2 $ 1.0 $ 0.4    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Exercisable, Weighted Average Remaining Contractual Terms                     7 years 226 days        
Intrinsic value of options exercised                     $ 0.0        
Unrecognized stock-based compensation expense                     $ 2.9        
Unrecognized stock-based compensation expense, period of recognition                     2 years        
Unvested activity                              
Nonvested at the beginning of the period (in shares)                     746,410 839,505      
Granted (in shares)                     532,615 450,894      
Vested (in shares)                     (41,673) (84,685)      
Exercised stock appreciation rights (in shares)                       (52,667)      
Forfeited stock appreciation rights (in shares)                     (385,253) (406,637)      
Nonvested at the end of the period (in shares)                     852,099 746,410 839,505    
Weighted Average Grant Date Fair Value                              
Nonvested at the beginning of the period (in dollars per share)                     $ 23.87 $ 22.27      
Granted (in dollars per share) $ 3.39 $ 5.17 $ 6.72 $ 7.46 $ 7.55   $ 7.25 $ 8.60 $ 7.07 $ 6.86 16.53 25.20      
Vested (in dollars per share)                     24.05 23.23      
Exercised (in dollars per share)                       20.21      
Forfeited (in dollars per share)                     22.36 22.65      
Nonvested at the end of the period (in dollars per share)                     $ 19.74 $ 23.87 $ 22.27    
Stock Appreciation Rights (SARs) | Minimum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period (in years)                     1 year        
Stock Appreciation Rights (SARs) | $16.53 - $22.70                              
Weighted Average Exercise Price                              
Range of Exercisable Prices, low end of range (in dollars per share)                     $ 19,650        
Range of Exercisable Prices, high end of range (in dollars per share)                     23,430        
Stock Appreciation Rights (SARs) | $23.03 - $26.92                              
Weighted Average Exercise Price                              
Range of Exercisable Prices, low end of range (in dollars per share)                     23,730        
Range of Exercisable Prices, high end of range (in dollars per share)                     $ 26,920        
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs)                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Expiration period (in years)                     10 years        
Granted (in shares) 532,615 12,401 15,808 84,290 31,405 255,090 51,900 15,000 5,018 903,814          
Unvested activity                              
Granted (in shares) 532,615 12,401 15,808 84,290 31,405 255,090 51,900 15,000 5,018 903,814          
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs) | Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period (in years)                     5 years        
May 2014 Grant 1 | Stock Appreciation Rights (SARs)                              
Fair value assumptions                              
Risk-free interest rate (as a percent)           1.90%                  
Dividend yield (as a percent)           3.16%                  
Expected life           6 years                  
Volatility (as a percent)           43.20%                  
SAR grant price           $ 25.93                  
Fair value of award (in dollars per share)           8.16                  
Weighted Average Grant Date Fair Value                              
Granted (in dollars per share)           $ 8.16                  
May 2014 Grant 2 | Stock Appreciation Rights (SARs)                              
Fair value assumptions                              
Risk-free interest rate (as a percent)           1.82%                  
Dividend yield (as a percent)           3.05%                  
Expected life           6 years                  
Volatility (as a percent)           42.80%                  
SAR grant price           $ 26.92                  
Fair value of award (in dollars per share)           8.47                  
Weighted Average Grant Date Fair Value                              
Granted (in dollars per share)           $ 8.47