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Share-Based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-Based Compensation        
Total share-based compensation expense $ 226,000 $ 215,000 $ 873,000 $ 945,000
Total income tax benefit recognized 63,000 60,000 256,000 276,000
Non-employee members of Board of Directors        
Share-Based Compensation        
Fair value of stock granted to a member of the Board of Directors as a part of annual retainer $ 0 $ 5,000 $ 105,000 $ 127,000