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Earnings Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share A significant portion of the Company's non-vested share-based payment awards are considered participating securities and as such, the Company is required to use the two-class method for the computation of basic and diluted earnings per share. Under the two-class computation method, net losses are not allocated to participating securities unless the holder of the security has a contractual obligation to share in the losses. The non-vested share-based payment awards are not allocated losses as the awards do not have a contractual obligation to share in losses of the Company. The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for each of the years in the three-year period ended December 31, 2018:
| 2018 |  | 2017 |  | 2016
BASIC |  |  |  |  |
Net income attributable to common shareholders | $ | 220,838 |  |  | $ | 79,067 |  |  | $ | 89,109 |
Weighted-average number of common shares outstanding | 236,666,375 |  |  | 237,758,408 |  |  | 233,633,058 |
Net income attributable to common shareholders - per common share basic | $ | 0.93 |  |  | $ | 0.33 |  |  | $ | 0.38 |
DILUTED: |  |  |  |  |
Net income attributable to common shareholders - basic | $ | 220,838 |  |  | $ | 79,067 |  |  | $ | 89,109 |
Impact of assumed conversions | 2,528 |  |  | 147 |  |  | (159 | )
Net income attributable to common shareholders | $ | 223,366 |  |  | $ | 79,214 |  |  | $ | 88,950 |
Weighted-average common shares outstanding - basic | 236,666,375 |  |  | 237,758,408 |  |  | 233,633,058 |
Effect of dilutive securities: |  |  |  |  |
Unvested share-based payment awards and options | 528,495 |  |  | 86,285 |  |  | 230,352 |
Operating Partnership Units | 3,616,120 |  |  | 3,693,144 |  |  | 3,815,621 |
Weighted-average common shares outstanding - diluted | 240,810,990 |  |  | 241,537,837 |  |  | 237,679,031 |
Net income attributable to common shareholders - per common share diluted | $ | 0.93 |  |  | $ | 0.33 |  |  | $ | 0.37 |
For per common share amounts, all incremental shares are considered anti-dilutive for periods that have a loss from continuing operations attributable to common shareholders. In addition, other common share equivalents may be anti-dilutive in certain periods.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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