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Earnings Per Share (Details Textual) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1,116,325 1,232,000 844,036 924,161
Weighted Average Price of Antidilutive Securities Excluded from Computation of Earnings Per Share (in dollars per share) $ 26.49 $ 26.14 $ 26.93 $ 26.78