Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Summary of Restricted Stock Awards and Units (Details)

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Stock Based Compensation - Summary of Restricted Stock Awards and Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
2010 Plan | Common Stock        
Stock-based compensation        
Maximum number of shares of common stock that may be issued 2,130,000      
Number of shares of common stock available for grant 670,403      
Performance Share Unit Awards | 2010 Plan        
Weighted Average Grant Date Fair Value        
Granted (in dollars per share) $ 49.96 $ 53.50 $ 36.48  
Restricted Stock Unit Awards        
Shares        
Unvested at the beginning of the period (in shares) 36,022 35,676 45,599  
Granted (in shares) 134,218 49,349 47,360  
Vested (in shares) (88,225) (48,112) (56,863)  
Cancelled and forfeited (in shares) (2,112) (891) (420)  
Unvested at the end of the period (in shares) 79,903 36,022 35,676 45,599
Expected to vest in the future, at the end of the period (in shares) 78,921      
Weighted Average Grant Date Fair Value        
Unvested at the beginning of the period (in dollars per share) $ 42.73 $ 36.49 $ 33.28  
Granted (in dollars per share) 44.48 49.90 36.48  
Vested (in dollars per share) 39.73 45.49 22.05  
Cancelled and forfeited (in dollars per share) 44.48 49.90 36.48  
Unvested at the end of the period (in dollars per share) 48.87 $ 42.73 $ 36.49 $ 33.28
Expected to vest in the future, at the end of the period (in dollars per share) $ 48.87      
Weighted Average Remaining Contractual Term        
Unvested, Outstanding 1 year 10 months 28 days 1 year 4 months 24 days 1 year 4 months 24 days 1 year 3 months 25 days
Granted 1 year 25 days 9 months 18 days 9 months 3 days  
Expected to vest in future, at the end of the period 1 year 10 months 28 days