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Stock-Based Compensation Plans - Stock Performance Rights (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Valuation assumptions:    
Stock options expense $ 0 $ 0
Cash paid out for SPR exercises 200,000 500,000
Liability reflecting estimated fair value of future pay-outs $ 16,732,000 $ 14,437,000
Stock Performance Rights    
Stock Performance Rights    
Weighted average estimated value of SPRs outstanding (in USD per share) $ 26.66  
Valuation assumptions:    
Expected volatility, minimum, percent 30.30%  
Expected volatility, maximum, percent 53.70%  
Risk-free rate of return, minimum 0.20%  
Risk-free rate of return, maximum 0.90%  
Expected annual dividend $ 0  
Stock options expense 2,100,000  
Liability reflecting estimated fair value of future pay-outs $ 16,700,000  
Number of SPRs    
Outstanding at beginning of period (in shares) 581,000  
Exercised (in shares) (4,464)  
Outstanding at end of period (in shares) 576,536 581,000
Exercisable (in shares) 576,536  
Weighted Average Exercise Price    
Outstanding at beginning of period (in USD per share) $ 26.66 $ 26.88
Exercised (in USD per share)   55.46
Outstanding at end of period (in USD per share)   26.66
Exercisable (in USD per share)   $ 26.66
SPRs outstanding, intrinsic value $ 16,000,000  
Shares vested (in shares) 8,460  
Vested in period, fair value $ 200,000  
Weighted average remaining contractual term, SPRs outstanding (in years) 1 year 1 month 6 days  
Stock Performance Rights | Minimum    
Stock Performance Rights    
Expiration period (in years) 7 years  
Award vesting period (in years) 1 year  
Valuation assumptions:    
Expected term (in years) 1 month 6 days  
Stock Performance Rights | Maximum    
Stock Performance Rights    
Award vesting period (in years) 3 years  
Valuation assumptions:    
Expected term (in years) 2 years 6 months  
Stock options expense $ (100,000)