Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - (Details Textual)

v3.7.0.1
Stock-Based Compensation - (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
May 15, 2014
Dec. 31, 2016
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   $ 5,896 $ 5,161 $ 5,883    
Unrecognized compensation expense   $ 8,103        
Expected period of unrecognized compensation expense   2 years 10 months 9 days        
Outstanding stock options (in shares)   0 87,026 87,026 87,026  
Restricted stock units            
Stock-Based Compensation (Textual) [Abstract]            
Conversion of common stock upon vesting (in shares)   1        
Service period for awards   3 years        
Restricted stock units | Board of Directors            
Stock-Based Compensation (Textual) [Abstract]            
Service period for awards   1 year        
Restricted stock units | Certain executive management            
Stock-Based Compensation (Textual) [Abstract]            
Service period for awards   4 years        
Performance Restricted Stock Units            
Stock-Based Compensation (Textual) [Abstract]            
Conversion of common stock upon vesting (in shares)   1        
Service period for awards   2 years        
Stock appreciation rights            
Stock-Based Compensation (Textual) [Abstract]            
Percentage of SARs vesting annually   25.00%        
Grant expiration period   10 years