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Earnings and Dividends Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net income attributable to common stockholders | $ | 159,365 |  |  | $ | 151,540 |  |  | $ | 148,862 |
BASIC: |  |  |  |  |
Weighted average common shares outstanding | 40,894,219 |  |  | 39,013,412 |  |  | 37,604,594 |
DILUTED: |  |  |  |  |
Weighted average common shares outstanding | 40,894,219 |  |  | 39,013,412 |  |  | 37,604,594 |
Stock options and restricted shares | 67,703 |  |  | 52,497 |  |  | 34,842 |
Convertible senior notes - unsecured | 189,531 |  |  | 89,471 |  |  | 4,735 |
Average dilutive common shares outstanding | 41,151,453 |  |  | 39,155,380 |  |  | 37,644,171 |
Net income per common share - basic | $ | 3.90 |  |  | $ | 3.88 |  |  | $ | 3.96 |
Net income per common share - diluted | $ | 3.87 |  |  | $ | 3.87 |  |  | $ | 3.95 |
Net share effect of anti-dilutive stock options | 573 |  |  | 6,366 |  |  | 51,603 |
Regular dividends declared per common share | $ | 3.80 |  |  | $ | 3.60 |  |  | $ | 3.40 |

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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://www.xbrl.org/2003/role/presentationRef -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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