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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 689 $ 836
Unearned compensation 1,760  
Performance Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unearned compensation related to options $ 651  
Remaining service period 10 months  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Remaining requisite service period 27 months  
Time-Vested Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unearned compensation related to options $ 1,066  
Remaining service period 29 months