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Earnings Per Share (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Jul. 27, 2017
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Line Items]      
Treasury Stock Acquired, Average Cost Per Share   $ 32.90  
Stock Repurchase Program, Authorized Amount $ 20,000 $ 20,000  
Stock Repurchase Program Expiration Date Aug. 15, 2017 Aug. 15, 2017  
Payments for Repurchase of Common Stock   $ 3,058 $ 101,483
Stock Repurchased and Retired During Period, Shares   92,987  
Share Repurchase Program [Member]      
Earnings Per Share [Line Items]      
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 19,300  
Payments for Repurchase of Common Stock   $ 800  
Stock Repurchased and Retired During Period, Shares   35,338  
Shares Repurchased Under Stock Compensation Program [Member]      
Earnings Per Share [Line Items]      
Stock Repurchased During Period, Value   $ 2,200  
Stock Repurchased and Retired During Period, Shares   57,649  
Old Share Repurchase Program [Member]      
Earnings Per Share [Line Items]      
Stock Repurchased During Period, Shares   4,500  
New Share Repurchase Program [Member]      
Earnings Per Share [Line Items]      
Stock Repurchased During Period, Shares   30,838