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Stock-Based Compensation (Schedule of Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-Based Compensation [Abstract]        
Stock-based compensation expense $ 163 $ 173 $ 306 $ 590
Excess tax benefits related to stock-based compensation 11 11 146 13
Unrecognized stock-based compensation expense $ 677 $ 354 $ 677 $ 354
Weighted average period unrecognized expense is expected to be recognized 1 year 1 year 1 month 6 days