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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Nov. 30, 2016
May 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)           240,008      
Number of Shares                  
SARS exercised, shares           (28,109) (8,965) 0  
Forfeited (in shares)           (454,283)      
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           1,277,969      
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares           467,478      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 15.73      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms           6 years 11 months 8 days      
Number of exercisable options (in shares)           1,277,969      
Weighted average exercise price per share (in dollars per share)           $ 16.11      
Unvested activity                  
Nonvested at the beginning of the period (in shares)           743,583      
Granted (in shares)           240,008      
Forfeited stock appreciation rights (in shares)           (34,426)      
Nonvested at the end of the period (in shares)           494,882 743,583    
$7.00-$13.70                  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           484,331      
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares           242,513      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 9.41      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms           7 years 7 months 24 days      
Number of exercisable options (in shares)           484,331      
Weighted average exercise price per share (in dollars per share)           $ 9.24      
$16.53 - $22.70                  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           532,700      
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares           217,343      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 18.58      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms           6 years 9 months 10 days      
Number of exercisable options (in shares)           532,700      
Weighted average exercise price per share (in dollars per share)           $ 18.08      
$23.03 - $26.92                  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           260,938      
Share-based Compensation, Shares Authorized Under Stock Appreciation Rights, Exercise Price Range, Number Of Unvested Shares           7,622      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 24.84      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms           5 years 5 months 12 days      
Number of exercisable options (in shares)           260,938      
Weighted average exercise price per share (in dollars per share)           $ 24.84      
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           $ 17.88      
Granted (in shares)           229,440      
Fair value assumptions                  
Risk-free interest rate (as a percent) 2.87% 2.69% 2.17% 1.74% 1.39%        
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00%        
Expected life 6 years 6 years 6 years 6 years 6 years        
Volatility (as a percent) 44.70% 44.60% 43.90% 43.80% 42.10%        
SAR grant price (usd per share)   $ 19.80 $ 13.70 $ 12.25 $ 7.00       $ 24.65
Fair value of award (in dollars per share) $ 11.48 9.16 6.13 5.38 2.93 $ 9.17      
Number of Shares                  
Outstanding at beginning of period (in shares)           1,679,276      
Granted (in shares)           229,440      
SARS exercised, shares           (150,013)      
Forfeited (in shares)           (13,256)      
Outstanding at end of period (in shares)           1,745,447 1,679,276    
Weighted Average Exercise Price                  
Outstanding at beginning of period (usd per share)           $ 15.40      
Granted (usd per share)           19.99      
Forfeited/expired (usd per share)           24.53      
Outstanding at end of period           $ 15.73 $ 15.40    
Outstanding - Aggregate Intrinsic Value           $ 8,900,000 $ 7,900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised           500,000 300,000 0  
Recognized stock-based compensation expense           $ 1,900,000 $ 2,000,000.0 $ 1,700,000  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Exercisable, Weighted Average Remaining Contractual Terms           6 years 11 months 8 days      
Intrinsic value           $ 8,900,000      
Unrecognized stock-based compensation expense           $ 2,200,000      
Unrecognized stock-based compensation expense, period of recognition           1 year 9 months 18 days      
Unvested activity                  
Nonvested at the beginning of the period (in shares)           877,417      
Granted (in shares)           229,440      
Vested (in shares)           (626,123)      
Forfeited stock appreciation rights (in shares)           (13,256)      
Nonvested at the end of the period (in shares)           467,478 877,417    
Weighted Average Grant Date Fair Value                  
Nonvested at the beginning of the period (in dollars per share)           $ 4.42      
Granted (in dollars per share) $ 11.48 $ 9.16 $ 6.13 $ 5.38 $ 2.93 9.17      
Vested (in dollars per share)           4.63      
Forfeited (in dollars per share)           7.51      
Nonvested at the end of the period (in dollars per share)           $ 6.65 $ 4.42    
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) 7,622 221,818 266,540 21,686 554,719        
Unvested activity                  
Granted (in shares) 7,622 221,818 266,540 21,686 554,719        
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