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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2017
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Granted (in shares)                           286,251    
Number of Shares                                
Forfeited (in shares)                           (166,843)    
Weighted Average Exercise Price                                
SARS exercised, shares                           8,965,000 0 0
Options vested, outstanding (in shares)                           801,859    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                           877,417    
Weighted Average Exercise Price Per Share (in dollars per share)                           $ 15.40    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                           7 years 186 days    
Number of exercisable options (in shares)                           801,859    
Weighted average exercise price per share (in dollars per share)                           $ 18.23    
Unvested activity                                
Nonvested at the beginning of the period (in shares)                           692,562    
Granted (in shares)                           286,251    
Forfeited stock appreciation rights (in shares)                           (68,387)    
Nonvested at the end of the period (in shares)                           743,583 692,562  
$7.00-$13.70                                
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)                           163,601    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                           596,285    
Weighted Average Exercise Price Per Share (in dollars per share)                           $ 9.40    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                           8 years 237 days    
Number of exercisable options (in shares)                           163,601    
Weighted average exercise price per share (in dollars per share)                           $ 7.43    
$16.53 - $22.70                                
Weighted Average Exercise Price                                
Options vested, outstanding (in shares)                           377,147    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                           255,269    
Weighted Average Exercise Price Per Share (in dollars per share)                           $ 18.29    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                           6 years 241 days    
Number of exercisable options (in shares)                           377,147    
Weighted average exercise price per share (in dollars per share)                           $ 18.26    
$23.03 - $26.92                                
Weighted Average Exercise Price                                
Options vested, outstanding (in shares)                           261,111    
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares                           25,863    
Weighted Average Exercise Price Per Share (in dollars per share)                           $ 24.93    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                           6 years 120 days    
Number of exercisable options (in shares)                           261,111    
Weighted average exercise price per share (in dollars per share)                           $ 24.95    
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 $ 0
Unrecognized stock-based compensation expense                             $ 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]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period, Weighted Average Exercise Price                           $ 10.73    
Granted (in shares)                           266,540    
Fair value assumptions                                
Risk-free interest rate (as a percent) 2.17% 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% 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 years 6 months 6 years 6 months 6 years 6 months      
Volatility (as a percent) 43.90% 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 $ 13.70 $ 12.25 $ 7.00 $ 16.53 $ 20.48 $ 23.43 $ 25.11 $ 25.27   $ 23.25 $ 26.22 $ 23.03 $ 22.70      
Fair value of award (in dollars per share) 6.13 5.38 2.93 3.39 5.17 6.72 7.46 7.55   7.25 8.60 7.07 6.86 $ 6.13    
Number of Shares                                
Outstanding at beginning of period (in shares)                           1,535,873    
Granted (in shares)                           266,540    
Forfeited (in shares)                           (90,434)    
Outstanding at end of period (in shares)                           1,679,276 1,535,873  
Weighted Average Exercise Price                                
Outstanding at beginning of period                           $ 15.81    
Granted                           13.70    
Forfeited/expired                           19.04    
Outstanding at end of period                           $ 15.40 $ 15.81  
SARS exercised, shares                           32,703    
Outstanding - Aggregate Intrinsic Value                           $ 7,900,000 $ 3,400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised                           300,000 0 0
Recognized stock-based compensation expense                           $ 2,000,000 $ 1,700,000 $ 1,200,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Exercisable, Weighted Average Remaining Contractual Terms                           7 years 186 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested                           $ 2,400,000    
Unrecognized stock-based compensation expense                           $ 2,100,000    
Unrecognized stock-based compensation expense, period of recognition                           1 year 256 days    
Unvested activity                                
Nonvested at the beginning of the period (in shares)                           1,014,524    
Granted (in shares)                           266,540    
Vested (in shares)                           (280,510)    
Forfeited stock appreciation rights (in shares)                           (90,434)    
Nonvested at the end of the period (in shares)                           877,417 1,014,524  
Weighted Average Grant Date Fair Value                                
Nonvested at the beginning of the period (in dollars per share)                           $ 3.84    
Granted (in dollars per share) $ 6.13 $ 5.38 $ 2.93 $ 3.39 $ 5.17 $ 6.72 $ 7.46 $ 7.55   $ 7.25 $ 8.60 $ 7.07 $ 6.86 6.13    
Vested (in dollars per share)                           3.59    
Forfeited (in dollars per share)                           5.96    
Nonvested at the end of the period (in dollars per share)                           $ 4.42 $ 3.84  
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Exercised In Period                           (32,703)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period, Weighted Average Grant Date Fair Value                           $ 3.11    
Stock Appreciation Rights (SARs) | Minimum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period (in years)                           3 years    
Stock Appreciation Rights (SARs) | $7.00-$13.70                                
Weighted Average Exercise Price                                
Range of Exercisable Prices, low end of range (in dollars per share)                           $ 7    
Range of Exercisable Prices, high end of range (in dollars per share)                           13.70    
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) 266,540 21,686 554,719 532,615                        
Unvested activity                                
Granted (in shares) 266,540 21,686 554,719 532,615                        
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