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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 30, 2015
Apr. 29, 2015
Apr. 28, 2010
Apr. 25, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance shares, minimum target (as a percent) 0.00%        
Performance shares, maximum target (as a percent) 150.00%        
Number of unvested options (in shares) 0        
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense $ 476        
Unrecognized compensation costs $ 3,100        
Unrecognized compensation costs, period of recognition 2 years 6 months        
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense $ 661        
Unrecognized compensation costs $ 3,500        
Unrecognized compensation costs, period of recognition 2 years 2 months 12 days        
The 2007 Long-Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant         428,996
The 2010 Long-Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant   945,002   445,002  
Increase in number of shares available for grant     500,000    
2019 Incentive Program | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive program, number of shares modified 3,494        
Incremental expense recognized $ 112        
2019 Incentive Program | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive program, number of shares modified 8,208        
Incremental expense recognized $ 250