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Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2020
Mar. 31, 2020
Jul. 30, 2019
Mar. 31, 2019
Jul. 31, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2019
Jul. 30, 2018
Number of Shares                      
SARS exercised, shares               (11,246) (28,109)    
Weighted Average Exercise Price                      
Options vested, outstanding (in shares)             1,523,184        
Options non-vested (in shares)             877,947        
Weighted Average Exercise Price Per Share (in dollars per share)             $ 14.37        
Weighted-Average Remaining Contractual Life in Years             6 years 6 months 10 days        
Number of exercisable options (in shares)             1,523,184        
Weighted average exercise price per share (in dollars per share)             $ 15.41        
$7.00-$14.89                      
Weighted Average Exercise Price                      
Options vested, outstanding (in shares)             677,299        
Options non-vested (in shares)             711,856        
Weighted Average Exercise Price Per Share (in dollars per share)             $ 9.95        
Weighted-Average Remaining Contractual Life in Years             7 years 6 months 14 days        
Number of exercisable options (in shares)             677,299        
Weighted average exercise price per share (in dollars per share)             $ 9.45        
$16.53 - $22.70                      
Weighted Average Exercise Price                      
Options vested, outstanding (in shares)             646,894        
Options non-vested (in shares)             163,550        
Weighted Average Exercise Price Per Share (in dollars per share)             $ 19.33        
Weighted-Average Remaining Contractual Life in Years             5 years 6 months 7 days        
Number of exercisable options (in shares)             646,894        
Weighted average exercise price per share (in dollars per share)             $ 18.75        
$23.03 - $26.92                      
Weighted Average Exercise Price                      
Options vested, outstanding (in shares)             198,991        
Options non-vested (in shares)             2,541        
Weighted Average Exercise Price Per Share (in dollars per share)             $ 24.87        
Weighted-Average Remaining Contractual Life in Years             3 years 7 months 9 days        
Number of exercisable options (in shares)             198,991        
Weighted average exercise price per share (in dollars per share)             $ 24.87        
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) 0.44% 0.76% 1.84% 2.52% 2.87% 2.69%          
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%          
Expected life 6 years 6 years 6 years 6 years 6 years 6 years          
Volatility (as a percent) 60.30% 45.20% 47.10% 46.20% 44.70% 44.60%          
SAR grant price (usd per share) $ 14.89 $ 10.29   $ 22.51   $ 19.80       $ 27.39 $ 24.65
Number of Shares                      
Outstanding at beginning of period (in shares)             1,908,220        
Granted (in shares)             805,678        
SARS exercised, shares             (60,532)        
Forfeited (in shares)             (252,235)        
Outstanding at end of period (in shares)             2,401,131 1,908,220      
Weighted Average Exercise Price                      
Outstanding at beginning of period (usd per share)             $ 16.44        
Granted (usd per share)             10.41        
Exercised (in dollars per share)             9.17        
Forfeited/expired (usd per share)             18.63        
Outstanding at end of period             $ 14.37 $ 16.44      
Outstanding - Aggregate Intrinsic Value             $ 11.7 $ 13.0      
Total intrinsic value of SARs             0.5 0.3 $ 0.5    
Recognized stock-based compensation expense             1.8 $ 1.9 $ 1.8    
Unrecognized stock-based compensation expense             $ 2.5        
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)             449,736        
Granted (in shares)             805,678        
Vested (in shares)             (253,741)        
Forfeited             123,726        
Nonvested at the end of the period (in shares)             877,947 449,736      
Weighted Average Grant Date Fair Value                      
Nonvested at the beginning of the period (in dollars per share)             $ 9.32        
Granted (in dollars per share) $ 8.12 $ 3.03 $ 12.80 $ 10.62 $ 11.48 $ 9.16 3.16        
Vested (in dollars per share)             7.81        
Forfeited (in dollars per share)             6.54        
Nonvested at the end of the period (in dollars per share)             4.50 $ 9.32      
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) | $23.03 - $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) 20,526 785,152 13,244 216,100 7,622 221,818