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Stock-Based Compensation - (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
May. 15, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 26, 2011
Stock-Based Compensation (Textual) [Abstract]          
Common Stock (in shares) 5,960,000       4,160,000
Number of additional shares reserved for issuance (in shares) 1,800,000        
Stock-based compensation cost relating to the stock options and restricted stock units   $ 5,161 $ 5,883 $ 5,416  
Unrecognized compensation expense   $ 6,438      
Expected period of unrecognized compensation expense   3 years 2 months 9 days      
Restricted stock units          
Stock-Based Compensation (Textual) [Abstract]          
Conversion of common stock upon vesting (in shares)   1      
Service period for RSU awards   3 years      
Amount of Awards, Exercised/Restricted stock units vested (in shares)   295,089 124,906 192,190  
Restricted stock units | Board of Directors          
Stock-Based Compensation (Textual) [Abstract]          
Service period for RSU awards   1 year      
Restricted stock units | Certain executive management          
Stock-Based Compensation (Textual) [Abstract]          
Service period for RSU awards   4 years      
Stock appreciation rights          
Stock-Based Compensation (Textual) [Abstract]          
Percentage of SAR's vesting annually   25.00%      
Grant expiration period   10 years