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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2021
Oct. 31, 2020
Mar. 31, 2020
Jul. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 31, 2019
Number of Shares                  
Stock appreciation rights exercised (in shares)           (28,789) (6,236) (11,246)  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           1,729,175      
Options non-vested (in shares)           664,880      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 14.75      
Weighted-Average Remaining Contractual Life in Years           5 years 8 months 23 days      
Number of exercisable options (in shares)           1,729,175      
Weighted average exercise price per share (in dollars per share)           $ 15.21      
$7.00 - $14.89                  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           807,168      
Options non-vested (in shares)           443,256      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 9.87      
Weighted-Average Remaining Contractual Life in Years           6 years 6 months 10 days      
Number of exercisable options (in shares)           807,168      
Weighted average exercise price per share (in dollars per share)           $ 9.48      
$16.53 - $22.70                  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           727,909      
Options non-vested (in shares)           221,624      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 19.12      
Weighted-Average Remaining Contractual Life in Years           5 years 3 months 21 days      
Number of exercisable options (in shares)           727,909      
Weighted average exercise price per share (in dollars per share)           $ 19.01      
$23.25 - $26.92                  
Weighted Average Exercise Price                  
Options vested, outstanding (in shares)           194,098      
Options non-vested (in shares)           0      
Weighted Average Exercise Price Per Share (in dollars per share)           $ 24.80      
Weighted-Average Remaining Contractual Life in Years           2 years 7 months 9 days      
Number of exercisable options (in shares)           194,098      
Weighted average exercise price per share (in dollars per share)           $ 24.80      
Stock Appreciation Rights (SARs)                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period (in years)           3 years      
Expiration period (in years)           10 years      
Fair value assumptions                  
Risk-free interest rate (as a percent) 0.91% 0.44% 0.76% 1.84% 2.52%        
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) 61.90% 60.30% 45.20% 47.10% 46.20%        
SAR grant price (usd per share) $ 18.58 $ 14.89 $ 10.29   $ 22.51       $ 27.39
Number of Shares                  
Outstanding at beginning of period (in shares)           2,401,131      
Granted (in shares)           184,641      
Stock appreciation rights exercised (in shares)           (107,413)      
Forfeited (in shares)           (84,304)      
Outstanding at end of period (in shares)           2,394,055 2,401,131    
Weighted Average Exercise Price                  
Outstanding at beginning of period (usd per share)           $ 14.37      
Granted (usd per share)           18.58      
Exercised (in dollars per share)           10.81      
Forfeited/expired (usd per share)           17.31      
Outstanding at end of period           $ 14.75 $ 14.37    
Outstanding - Aggregate Intrinsic Value           $ 8.6 $ 11.7    
Total intrinsic value of SARs           0.6 0.5 $ 0.3  
Recognized stock-based compensation expense           1.8 $ 1.7 $ 1.8  
Unrecognized stock-based compensation expense           $ 2.2      
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)           877,947      
Granted (in shares)           184,641      
Vested (in shares)           (348,340)      
Forfeited           (49,368)      
Nonvested at the end of the period (in shares)           664,880 877,947    
Weighted Average Grant Date Fair Value                  
Nonvested at the beginning of the period (in dollars per share)           $ 4.50      
Granted (in dollars per share) $ 10.48 $ 8.12 $ 3.03 $ 12.80 $ 10.62 10.48      
Vested (in dollars per share)           5.33      
Forfeited (in dollars per share)           5.77      
Nonvested at the end of the period (in dollars per share)           5.63 $ 4.50    
Stock Appreciation Rights (SARs) | $7.00 - $14.89                  
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)           14.89      
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) | $23.25 - $26.92                  
Weighted Average Exercise Price                  
Range of Exercisable Prices, low end of range (in dollars per share)           23.25      
Range of Exercisable Prices, high end of range (in dollars per share)           $ 26.92      
2013 Equity and Incentive Compensation Plan | Stock Appreciation Rights (SARs)                  
Unvested activity                  
Granted (in shares) 184,641 20,526 785,152 13,244 216,100