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Share-Based Compensation - Stock Option Activity (Details) - Stock options - 2021 Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares        
Options outstanding, beginning of period (in shares) 1,090,300 1,529,800 2,252,275  
Granted (in shares) 0 0 20,000  
Exercised (in shares) (266,000) (426,150) (730,125)  
Forfeited (in shares) 0 (13,350) (12,350)  
Options outstanding, end of period (in shares) 824,300 1,090,300 1,529,800 2,252,275
Options exercisable at period end (in shares) 786,800      
Weighted-Average Exercise Price        
Options outstanding, beginning balance (in dollars per share) $ 17.68 $ 17.40 $ 16.92  
Granted (in dollars per share) 0 0 20.48  
Exercised (in dollars per share) 17.01 16.55 15.94  
Forfeited (in dollars per share) 0 21.89 20.80  
Options outstanding, ending balance (in dollars per share) 17.89 $ 17.68 $ 17.40 $ 16.92
Options exercisable at period end (in dollars per share) $ 17.81      
Options outstanding, weighted average contractual life 3 years 8 months 12 days 4 years 6 months 5 years 3 months 18 days 6 years 1 month 6 days
Options exercisable at period end, weighted average contractual life 3 years 7 months 6 days      
Aggregate Intrinsic Value        
Options outstanding, intrinsic value $ 21,200 $ 13,436 $ 13,479 $ 7,713
Exercised, intrinsic value 5,625 $ 4,911 $ 6,088  
Options exercisable at period end, intrinsic value $ 20,303