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Earnings Per Share (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Jul. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Line Items]      
Stock Repurchased During Period, Shares   374,963  
Treasury Stock Acquired, Average Cost Per Share   $ 26.88  
Stock Repurchase Program, Authorized Amount   $ 25,000  
Payments for Repurchase of Common Stock   $ (9,240) $ (10,585)
Share Repurchase Program [Member]      
Earnings Per Share [Line Items]      
Stock Repurchased During Period, Shares   327,232  
Stock Repurchase Program, Authorized Amount $ 42,500    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 25,000 $ 18,100  
Stock Repurchase Program Expiration Date Aug. 31, 2016    
Amount paid to repurchase shares   8,700  
Payments for Repurchase of Common Stock   $ 7,800  
Shares Repurchased Under Stock Compensation Program [Member]      
Earnings Per Share [Line Items]      
Stock Repurchased During Period, Shares   47,731  
Amount paid to repurchase shares   $ 1,400