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Stockholders' Equity - Stock Options and Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Stock-based compensation, general disclosures.      
Stock-based compensation expense $ 2,457 $ 2,728  
Common stock options      
Stock-based compensation, general disclosures.      
Stock-based compensation expense 1,200 $ 900  
Total unrecognized pre-tax compensation expense related to nonvested stock option awards $ 8,800    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 1 month 6 days    
Options Outstanding      
Outstanding at beginning of period 1,039,709    
Granted 132,606    
Exercised (53,967)    
Forfeited (10,866)    
Cancelled/Expired (5,982)    
Outstanding at end of period 1,101,500   1,039,709
Weighted Average Exercise Price Per Share      
Outstanding at beginning of period $ 36.43    
Granted 51.60    
Exercised 24.00    
Forfeited 46.28    
Cancelled/Expired 46.18    
Outstanding at end of period $ 38.72   $ 36.43
Other information      
Options exercisable number of shares exercisable 546,067 529,219  
Options exercisable, weighted-average exercise price $ 30.27 $ 17.88  
Weighted average remaining contractual life (in years) 5 years 7 months 6 days   5 years 7 months 6 days
Options exercisable, weighted-average remaining contractual life 4 years 8 months 12 days    
Aggregate Intrinsic Value, Options outstanding $ 18,893   $ 13,381
Aggregate Intrinsic Value, Exercised 1,516    
Aggregate Intrinsic Value, Options exercisable $ 14,229    
Common stock options | Minimum      
Stock-based compensation, general disclosures.      
Vesting period (in years) 3 years    
Term (in years) 7 years    
Common stock options | Maximum      
Stock-based compensation, general disclosures.      
Vesting period (in years) 4 years    
Term (in years) 10 years    
Common stock options | Chief Executive Officer [Member]      
Stock-based compensation, general disclosures.      
Share-based payment award, term 7 years    
Vesting period (in years) 3 years    
Number of consecutive trading days 20 days    
Common stock options | Chief Executive Officer [Member] | Minimum      
Stock-based compensation, general disclosures.      
Stock price $ 40.15    
Time-Based Restricted Stock Units | Non-employee Directors      
Units Outstanding      
Granted (in shares) 0    
Number of granted and vested restricted stock units 6,469    
2018 and 2021 PSUs      
Stock-based compensation, general disclosures.      
Stock-based compensation expense $ 200    
2016 Plan | Time-Based Restricted Stock Units      
Stock-based compensation, general disclosures.      
Stock-based compensation expense 1,300 $ 1,200  
Total unrecognized pre-tax compensation expense related to awards $ 7,900    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 months 3 days    
Units Outstanding      
Restricted stock unit awards outstanding at the beginning of the period (in shares) 211,469    
Granted (in shares) 48,893    
Vested (in shares) 61,682    
Cancelled (in shares) (3,382)    
Restricted stock unit awards outstanding at the end of the period (in shares) 195,298   211,469
Deferred and unissued (in shares) 6,469    
Weighted Average Grant Date Fair Value Per Unit      
Restricted stock unit awards outstanding at the beginning of the period (in dollars per share) $ 48.29    
Granted (in dollars per share) 51.60    
Vested (in dollars per share) 49.49    
Cancelled (in dollars per share) 54.25    
Restricted stock unit awards outstanding at the end of the period (in dollars per share) 48.63   $ 48.29
Deferred and unissued (in dollars per share) $ 38.94    
Aggregate Intrinsic Value      
Restricted stock unit awards, Average Intrinsic Value $ 10,642   $ 9,503
Restricted stock unit awards deferred and unissued, Average Intrinsic Value $ 352    
2016 Plan | Time-Based Restricted Stock Units | Minimum      
Stock-based compensation, general disclosures.      
Vesting period (in years) 1 year    
2016 Plan | Time-Based Restricted Stock Units | Maximum      
Stock-based compensation, general disclosures.      
Vesting period (in years) 3 years    
2016 Plan | Performance-based stock-settled restricted stock units      
Stock-based compensation, general disclosures.      
Estimated payout $ 500    
Stock-based compensation expense 300 $ 400  
Total unrecognized pre-tax compensation expense related to awards $ 1,800    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 10 months 24 days    
Units Outstanding      
Restricted stock unit awards outstanding at the beginning of the period (in shares) 79,303    
Granted (in shares) 35,929    
Vested (in shares) 34,159    
Cancelled (in shares) (19,032)    
Restricted stock unit awards outstanding at the end of the period (in shares) 62,041   79,303
Weighted Average Grant Date Fair Value Per Unit      
Restricted stock unit awards outstanding at the beginning of the period (in dollars per share) $ 47.83    
Granted (in dollars per share) 51.60    
Vested (in dollars per share) 33.98    
Cancelled (in dollars per share) 69.17    
Restricted stock unit awards outstanding at the end of the period (in dollars per share) $ 51.10   $ 47.83
Aggregate Intrinsic Value      
Restricted stock unit awards, Average Intrinsic Value $ 3,381   $ 3,564
2016 Plan | Performance-based stock-settled restricted stock units | Minimum      
Units Outstanding      
Percentage to earn or vest the performance-based stock-settled restricted stock units 50.00%    
2016 Plan | Performance-based stock-settled restricted stock units | Maximum      
Units Outstanding      
Percentage to earn or vest the performance-based stock-settled restricted stock units 150.00%    
2016 Plan | Tranche one | Performance-based stock-settled restricted stock units      
Stock-based compensation, general disclosures.      
Compensation arrangement 33.33%    
2016 Plan | Tranche two | Performance-based stock-settled restricted stock units      
Stock-based compensation, general disclosures.      
Compensation arrangement 66.67%