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Stock-Based Compensation (Performance Stock Units) (Details) - Performance Stock Units - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2021
Oct. 31, 2020
Mar. 31, 2020
Aug. 31, 2019
Jul. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Performance period             3 years    
Fair value assumptions                  
Risk-free interest rate (as a percent) 0.25% 0.17% 0.56% 1.57% 1.75% 2.48%      
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%      
Expected Life (Years) 2 years 9 months 29 days 2 years 2 months 12 days 2 years 9 months 21 days 2 years 4 months 28 days 2 years 6 months 2 years 9 months 25 days      
Volatility 50.70% 53.70% 36.00% 34.90% 34.30% 33.80%      
Fair value of award (in dollars per share) $ 25.38 $ 17.01 $ 4.40 $ 23.38 $ 40.07 $ 29.04 $ 25.38    
Recognized stock-based compensation expense             $ 5.1 $ 3.2 $ 4.8
Unrecognized stock-based compensation expense             $ 5.6    
Unrecognized stock-based compensation expense, period of recognition             1 year 10 months 24 days    
Unvested activity                  
Nonvested at the beginning of the period (in shares)             696,318    
Granted (in shares) 316,959 11,194 513,995 38,006 6,189 233,112 316,959    
Forfeited (in shares)             (44,839)    
Vested (in shares)             (214,645)    
Nonvested at the end of the period (in shares)             753,793 696,318  
Weighted Average Grant Date Fair Value                  
Nonvested at the beginning of the period (in dollars per share)             $ 11.85    
Granted (in dollars per share) $ 25.38 $ 17.01 $ 4.40 $ 23.38 $ 40.07 $ 29.04 25.38    
Forfeited (in dollars per share)             15.47    
Vested (in dollars per share)             26.84    
Nonvested at the end of the period (in dollars per share)             $ 13.05 $ 11.85  
Shares expected to be issued (in shares)             0    
Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Payout of PSUs (percent of initial grant)             0.00%    
Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Payout of PSUs (percent of initial grant)             200.00%