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Earnings and Dividends Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Common Share The weighted average number of common shares outstanding during the reporting period is used to calculate basic earnings per common share. Diluted earnings per common share assume the exercise of stock options and the conversion of our convertible debt using the treasury stock method, to the extent dilutive. If our average stock price for the period increases over the conversion price of our convertible debt, the conversion feature will be considered dilutive. The following table summarizes the average number of common shares and the net income used in the calculation of basic and diluted earnings per common share (in thousands, except share and per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income attributable to common stockholders | $ | 42,595 |  |  | $ | 42,758 |  |  | $ | 147,986 |  |  | $ | 118,417 |
BASIC: |  |  |  |  |  |  |
Weighted average common shares outstanding | 44,661,650 |  |  | 43,505,332 |  |  | 44,641,748 |  |  | 43,187,847 |
DILUTED: |  |  |  |  |  |  |
Weighted average common shares outstanding | 44,661,650 |  |  | 43,505,332 |  |  | 44,641,748 |  |  | 43,187,847 |
Stock options | 753 |  |  | 79,933 |  |  | 1,766 |  |  | 73,924 |
Convertible subordinated debentures | — |  |  | 275,824 |  |  | — |  |  | 232,943 |
Weighted average dilutive common shares outstanding | 44,662,403 |  |  | 43,861,089 |  |  | 44,643,514 |  |  | 43,494,714 |
Net income attributable to common stockholders - basic | $ | 0.95 |  |  | $ | 0.98 |  |  | $ | 3.31 |  |  | $ | 2.74 |
Net income attributable to common stockholders - diluted | $ | 0.95 |  |  | $ | 0.97 |  |  | $ | 3.31 |  |  | $ | 2.72 |
Incremental anti-dilutive shares excluded: |  |  |  |  |  |  |
Net share effect of stock options with an exercise price in excess of the average market price for our common shares | 410,012 |  |  | 7,858 |  |  | 427,180 |  |  | 11,200 |
Regular dividends declared per common share | $ | 1.1025 |  |  | $ | 1.05 |  |  | $ | 3.3075 |  |  | $ | 3.15 |

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