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Stock-Based Compensation - Restricted Stock, Textual (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting date fair value     $ 2,700 $ 2,000
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 292 $ 494 1,100 1,400
Tax benefit from compensation expense 102 $ 173 384 $ 479
Unrecognized compensation expense 1,800   $ 1,800  
Compensation expense expected to be recognized, weighted average period     1 year 9 months 10 days  
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 236   $ 472  
Tax benefit from compensation expense 83   165  
Unrecognized compensation expense $ 1,800   $ 1,800  
Compensation expense expected to be recognized, weighted average period     2 years 3 months 3 days