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Stock-Based Compensation - Summary of Company's SARs Activity (Details) - SARs - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Shares      
Beginning balance (in shares)   144,999  
Exercised (in shares)   (20,560)  
Forfeited (in shares)   (2,088)  
Ending balance (in shares) 122,351 122,351 144,999
Weighted- Average Exercise Price      
Beginning balance (in dollars per share)   $ 32.99  
Exercised (in dollars per share)   24.12  
Forfeited (in dollars per share)   31.92  
Ending balance (in dollars per share) $ 34.50 $ 34.50 $ 32.99
Outstanding, average remaining contractual term (in years) 1 year 4 months 28 days   1 year 11 months 12 days
Aggregate intrinsic value $ 1,046 $ 1,046 $ 1,095