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Stock-Based Compensation Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement [Line Items]        
Stock options terms (in years)     10 years  
Stock-based compensation expense $ 1,552 $ 1,533 $ 4,808 $ 4,371
Directors' Plan [Member]        
Statement [Line Items]        
Shares reserved for future grants under the stock option and compensation plan 384,000   384,000  
Employee Equity Plan [Member]        
Statement [Line Items]        
Awards vesting period (in years)     3 years  
Shares reserved for future grants under the stock option and compensation plan 11,438,758   11,438,758