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Net Income Per Common Share (Details) - shares
1 Months Ended 3 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Mar. 31, 2017
Net Income Per Common Share [Line Items]      
Weighted average number of diluted shares outstanding adjustment (in shares)   553,903 472,705
Stock Options [Member]      
Net Income Per Common Share [Line Items]      
Antidilutive securities excluded from computation of EPS   153,908 177,781
Options, granted (in shares) 102,400    
Restricted Stock Units (RSUs) [Member]      
Net Income Per Common Share [Line Items]      
Other than options, granted (in shares) 88,543    
Performance Share Awards [Member]      
Net Income Per Common Share [Line Items]      
Other than options, granted (in shares) 70,005    
Performance period   3 years  
Minimum range of target award of stock plan   0.00%  
Maximum range of target award of stock plan   250.00%