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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 93 Months Ended
May 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2008
Dec. 31, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation expense   $ 865 $ 616 $ 2,731 $ 1,817        
Stock-based compensation expense to be recognized through results of operations   $ 8,000   $ 8,000   $ 8,000      
Employee Stock Award Plan-2008                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for issuance (in shares)   1,245,650   1,245,650   1,245,650 1,394,578 1,900,000  
Additional shares authorized (in shares) 1,500,000     0   1,500,000      
Percentage of option awards vest and exercisable in installments       20.00%          
Employee Stock Award Plan-2008 | Options Awards                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expiration period       10 years          
Employee Stock Award Plan-2008 | Restricted Stock Awards | Share-based Compensation Award, Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       3 years          
Employee Stock Award Plan-2008 | Restricted Stock Awards | Share-based Compensation Award, Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       5 years          
Director Plan - 2005                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for issuance (in shares)   74,771   74,771   74,771 69,938   300,000