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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Approved and authorized maximum number of shares to be issued (in shares)     3,000,000
Compensation expense related to stock based awards outstanding $ 350 $ 433  
Exercise of stock options (in shares) 103,855 3,924  
Proceeds received upon exercise of stock options $ 623 $ 8  
Total unrecognized compensation expense $ 2,400    
Share-based compensation cost not yet recognized, period for recognition   2 years  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, expiration period   10 years  
Forfeiture rate 5.50%    
Stock options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, vesting period   3 years  
Stock options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, vesting period   5 years  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeiture rate 5.50%    
2011 LTIP | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeiture rate 3.20%