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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2016
May 31, 2016
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                         536,773    
Number of Shares                              
Forfeited (in shares)                         (96,206)    
Weighted Average Exercise Price                              
Options vested, outstanding (in shares)                         521,349    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                         1,014,524    
Weighted Average Exercise Price Per Share (in dollars per share)                         $ 15.81    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                         7 years 296 days    
Number of exercisable options (in shares)                         521,349    
Weighted average exercise price per share (in dollars per share)                         $ 21.68    
Unvested activity                              
Nonvested at the beginning of the period (in shares)                         315,212    
Granted (in shares)                         536,773    
Forfeited stock appreciation rights (in shares)                         (63,217)    
Nonvested at the end of the period (in shares)                         692,562 315,212  
Exercise Price Range Four [Member]                              
Weighted Average Exercise Price                              
Range of Exercisable Prices, low end of range (in dollars per share)                         $ 31.75    
Range of Exercisable Prices, high end of range (in dollars per share)                         $ 31.75    
Options vested, outstanding (in shares)                         0    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                         538,862    
Weighted Average Exercise Price Per Share (in dollars per share)                         $ 7.21    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                         9 years 131 days    
Number of exercisable options (in shares)                         0    
Weighted average exercise price per share (in dollars per share)                         $ 0.00    
$16.53 - $22.70                              
Weighted Average Exercise Price                              
Options vested, outstanding (in shares)                         274,632    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                         414,447    
Weighted Average Exercise Price Per Share (in dollars per share)                         $ 18.44    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                         7 years 204 days    
Number of exercisable options (in shares)                         274,632    
Weighted average exercise price per share (in dollars per share)                         $ 18.53    
$23.03 - $26.92                              
Weighted Average Exercise Price                              
Options vested, outstanding (in shares)                         246,717    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                         61,215    
Weighted Average Exercise Price Per Share (in dollars per share)                         $ 25.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                         7 years 150 days    
Number of exercisable options (in shares)                         246,717    
Weighted average exercise price per share (in dollars per share)                         $ 25.18    
Stock options                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period (in years)                         3 years    
Weighted Average Exercise Price                              
Recognized stock-based compensation expense                         $ 0 $ 0 $ 100,000
Unrecognized stock-based compensation expense                         $ 0 $ 0  
Weighted Average Grant Date Fair Value                              
Stock options exercised                         0 0 0
Proceeds from Stock Options Exercised                         $ 0 $ 0 $ 0
Stock options | Maximum                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Expiration period (in years)                         7 years    
Stock Appreciation Rights (SARs)                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                         576,405    
Fair value assumptions                              
Risk-free interest rate (as a percent) 1.74% 1.39% 1.70% 1.78% 2.03% 1.92% 2.00%   1.98% 1.91% 1.41% 1.17%      
Dividend yield (as a percent) 0.00% 0.00% 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 years 6 years 6 months 6 years 6 months 6 years 6 months      
Volatility (as a percent) 43.80% 42.10% 35.80% 38.60% 40.60% 41.20% 41.20%   44.30% 43.80% 44.10% 44.10%      
SAR grant price $ 12.25 $ 7.00 $ 16.53 $ 20.48   $ 25.11 $ 25.27   $ 23.25 $ 26.22 $ 23.03 $ 22.70     $ 23.43
Fair value of award (in dollars per share) 5.38 2.93 3.39 5.17 $ 6.72 7.46 7.55   7.25 8.60 7.07 6.86 $ 3.02    
Number of Shares                              
Outstanding at beginning of period (in shares)                         1,100,410    
Granted (in shares)                         576,405    
Forfeited (in shares)                         (140,942)    
Outstanding at end of period (in shares)                         1,535,873 1,100,410  
Weighted Average Exercise Price                              
Outstanding at beginning of period                         $ 20.55    
Granted                         7.20    
Forfeited/expired                         17.58    
Outstanding at end of period                         $ 15.81 $ 20.55  
Outstanding - Aggregate Intrinsic Value                         $ 3,400,000 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised                         0 0 $ 200,000
Recognized stock-based compensation expense                         $ 1,700,000 $ 1,200,000 $ 1,000,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Exercisable, Weighted Average Remaining Contractual Terms                         7 years 6 months    
Intrinsic value of options exercised                         $ 0    
Unrecognized stock-based compensation expense                         $ 2,500,000    
Unrecognized stock-based compensation expense, period of recognition                         1 year 256 days    
Unvested activity                              
Nonvested at the beginning of the period (in shares)                         852,099    
Granted (in shares)                         576,405    
Vested (in shares)                         (328,965)    
Forfeited stock appreciation rights (in shares)                         (85,015)    
Nonvested at the end of the period (in shares)                         1,014,524 852,099  
Weighted Average Grant Date Fair Value                              
Nonvested at the beginning of the period (in dollars per share)                         $ 5.04    
Granted (in dollars per share) $ 5.38 $ 2.93 $ 3.39 $ 5.17 $ 6.72 $ 7.46 $ 7.55   $ 7.25 $ 8.60 $ 7.07 $ 6.86 3.02    
Vested (in dollars per share)                         5.40    
Forfeited (in dollars per share)                         4.28    
Nonvested at the end of the period (in dollars per share)                         $ 3.84 $ 5.04  
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) | Exercise Price Range Four [Member]                              
Weighted Average Exercise Price                              
Range of Exercisable Prices, low end of range (in dollars per share)                         $ 7.00    
Range of Exercisable Prices, high end of range (in dollars per share)                         12.25    
Stock Appreciation Rights (SARs) | $16.53 - $22.70                              
Weighted Average Exercise Price                              
Range of Exercisable Prices, low end of range (in dollars per share)                         16.53    
Range of Exercisable Prices, high end of range (in dollars per share)                         22.70    
Stock Appreciation Rights (SARs) | $23.03 - $26.92                              
Weighted Average Exercise Price                              
Range of Exercisable Prices, low end of range (in dollars per share)                         23.03    
Range of Exercisable Prices, high end of range (in dollars per share)                         $ 26.92    
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) 21,686 554,719 532,615 12,401 15,808 84,290 31,405 255,090 51,900            
Unvested activity                              
Granted (in shares) 21,686 554,719 532,615 12,401 15,808 84,290 31,405 255,090 51,900            
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