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Stock-Based Compensation - Restricted Stock and Performance Unit Activity (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Allocated share-based compensation expense $ 2,100,000 $ 1,800,000 $ 4,600,000 $ 3,800,000
Tax benefit from compensation expense 514,000 485,000 1,100,000 896,000
Unrecognized compensation expense related to non-vested stock option grants $ 21,000   $ 21,000  
Restricted stock and performance units        
Number of Shares        
Outstanding - beginning of period (in shares)     1,718,838  
Granted (in shares)     652,909  
Vested (in shares)     (604,703)  
Forfeited (in shares)     (135,053)  
Outstanding - end of period (in shares) 1,631,991   1,631,991  
Weighted-Average Grant Date Fair Value        
Outstanding - beginning of period (in dollars per share)     $ 10.73  
Granted (in dollars per share)     15.65  
Vested (in dollars per share)     11.75  
Forfeited (in dollars per share)     13.18  
Outstanding - end of period (in dollars per share) $ 12.12   $ 12.12  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Equity instruments other than options, vested in period     $ 9,200,000 343,000
Total compensation cost not yet recognized, period for recognition     2 years 25 days  
Unrecognized compensation expense related to non-vested equity instruments other than options $ 13,500,000   $ 13,500,000  
Employee Stock Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Discount rate to the closing price, purchase date     10.00%  
Maximum amount of common shares purchased under ESPP of employee's base salary, percent 20.00%   20.00%  
Cap amount for shares purchased per employee     $ 25,000  
Allocated share-based compensation expense $ 37,000 $ 26,000 $ 259,000 $ 97,000
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Total compensation cost not yet recognized, period for recognition     2 months 1 day