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Earnings and Dividends Per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Net income attributable to common stockholders | $ | 42,758 |  |  | $ | 40,979 |  |  | $ | 118,417 |  |  | $ | 117,251 |
BASIC: |  |  |  |  |  |  |
Weighted average common shares outstanding | 43,505,332 |  |  | 42,187,077 |  |  | 43,187,847 |  |  | 41,808,017 |
DILUTED: |  |  |  |  |  |  |
Weighted average common shares outstanding | 43,505,332 |  |  | 42,187,077 |  |  | 43,187,847 |  |  | 41,808,017 |
Stock options | 79,933 |  |  | 98,269 |  |  | 73,924 |  |  | 66,917 |
Convertible subordinated debentures | 275,824 |  |  | 149,153 |  |  | 232,943 |  |  | 57,802 |
Weighted average dilutive common shares outstanding | 43,861,089 |  |  | 42,434,499 |  |  | 43,494,714 |  |  | 41,932,736 |
Net income attributable to common stockholders - basic | $ | .98 |  |  | $ | .97 |  |  | $ | 2.74 |  |  | $ | 2.80 |
Net income attributable to common stockholders - diluted | $ | .97 |  |  | $ | .97 |  |  | $ | 2.72 |  |  | $ | 2.80 |
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 | 7,858 |  |  | 615 |  |  | 11,200 |  |  | 31,616 |
Regular dividends declared per common share | $ | 1.05 |  |  | $ | 1.00 |  |  | $ | 3.15 |  |  | $ | 3.00 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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