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Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Potentially dilutive securities:        
Potentially dilutive securities (in shares) 302,550 772,873 462,317 935,027
Options to purchase common stock excluded from potentially dilutive securities (in shares) 291,700 0 133,500 0