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Stock-Based Compensation - Restricted Stock and Performance Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]    
Allocated share-based compensation expense $ 2,600 $ 2,000
Tax benefit from compensation expense 623 397
Unrecognized compensation expense related to non-vested stock option grants $ 52  
Restricted stock and performance units    
Number of Shares    
Outstanding - beginning of period (in shares) 1,718,838  
Granted (in shares) 255,514  
Vested (in shares) (340,129)  
Forfeited (in shares) (104,869)  
Outstanding - end of period (in shares) 1,529,354  
Weighted-Average Grant Date Fair Value    
Outstanding - beginning of period (in dollars per share) $ 10.73  
Granted (in dollars per share) 15.92  
Vested (in dollars per share) 12.53  
Forfeited (in dollars per share) 14.13  
Outstanding - end of period (in dollars per share) $ 10.97  
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 $ 5,200 2,000
Total compensation cost not yet recognized, period for recognition 1 year 9 months 3 days  
Unrecognized compensation expense related to non-vested equity instruments other than options $ 10,700  
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%  
Cap amount for shares purchased per employee $ 25  
Allocated share-based compensation expense $ 221 $ 71