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Net Income Per Common Share (Details) - shares
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Income Per Common Share [Line Items]          
Weighted average number of diluted shares outstanding adjustment (in shares)   366,251 388,777 436,941 507,197
Stock Options [Member]          
Net Income Per Common Share [Line Items]          
Antidilutive securities excluded from computation of EPS   209,907 209,102 315,440 203,001
Options, granted (in shares) 142,000        
Restricted Stock Units (RSUs) [Member]          
Net Income Per Common Share [Line Items]          
Other than options, granted (in shares) 119,814        
Performance Share Awards [Member]          
Net Income Per Common Share [Line Items]          
Antidilutive securities excluded from computation of EPS   0   31,028  
Other than options, granted (in shares) 108,400        
Performance period       3 years  
Minimum range of target award of stock plan       0.00%  
Maximum range of target award of stock plan       250.00%