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Stock-Based Compensation - Restricted and Performance Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
ESPP compensation expense $ 29 $ 41 $ 125 $ 189
Allocated share-based compensation expense 1,500 915 2,300 1,900
Tax benefit from compensation expense $ 378 $ 237 $ 585 482
Retricted and performance unit activity        
Number of Shares        
Outstanding - beginning of period (in shares)     478,891  
Granted (in shares)     756,153  
Vested (in shares)     (84,755)  
Forfeited (in shares)     (40,986)  
Outstanding - end of period (in shares) 1,109,303   1,109,303  
Weighted- Average Grant Date Fair Value        
Outstanding - beginning of period (in dollars per share)     $ 16.37  
Granted (in dollars per share)     13.16  
Vested (in dollars per share)     16.79  
Forfeited (in dollars per share)     15.60  
Outstanding - end of period (in dollars per share) $ 14.18   $ 14.18  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Total compensation cost not yet recognized $ 11,000   $ 11,000  
Total compensation cost not yet recognized, period for recognition     2 years 2 months 19 days  
Performance shares        
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     $ 1,200 $ 1,200
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 $ 338   $ 338  
Total compensation cost not yet recognized, period for recognition     2 years 2 months 1 day  
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, offering period     10.00%  
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