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Earnings Per Share
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The Company has unvested share-based payment awards with a right to receive non-forfeitable dividends, which are considered participating securities under ASC Topic 260, Earnings Per Share. The Company allocates earnings to participating securities and computes earnings per share using the two-class method. Under the two-class method, net income per share is computed by dividing net income allocated to common shareholders by the weighted average number of common shares outstanding for the period. In applying the two-class method, net income is allocated to both common shares and participating securities based on their respective weighted average shares outstanding for the period. The following table sets forth the computation of basic and diluted net income per common share under the two-class method for the three months ended March 31, 2019 and March 31, 2018, respectively:

Three months ended March 31,
20192018
Basic Earnings Per Share
Net Income$104,280,411 $111,248,743 
Less: Allocated to participating securities1,081,933 833,316 
Net Income available to common shareholders$103,198,478 $110,415,427 
Basic weighted average shares outstanding257,822,836 274,759,516 
Net Income per share - Basic$0.40 $0.40 
Diluted Earnings Per Share
Allocation of Net Income used in basic computation$103,198,478 $110,415,427 
Reallocation of undistributed earnings3,813 6,011 
Net Income per share - Diluted$103,202,291 $110,421,438 
Number of shares used in basic computation257,822,836 274,759,516 
Additional dilutive common stock equivalents1,282,396 2,749,912 
Diluted weighted average shares outstanding259,105,232 277,509,428 
Net income per share - Diluted$0.40 $0.40 
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive1,799,477 156,467