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Earnings per Share and Unit (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of earnings per share | The following summarizes the calculation of basic and diluted earnings per share:
|  | Year ended December 31, |
(in thousands, except per share data) |  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to common stockholders - basic |  | $ | 239,430 |  |  | $ | 249,127 |  |  |  | 159,949 |
Income attributable to common stockholders - diluted |  | $ | 239,430 |  |  | $ | 249,127 |  |  |  | 159,949 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding for basic EPS |  |  | 167,526 |  |  |  | 169,724 |  |  |  | 159,536 |
Weighted average common shares outstanding for diluted EPS (1) (2) |  |  | 167,771 |  |  |  | 170,100 |  |  |  | 159,960 |
Income per common share – basic |  | $ | 1.43 |  |  | $ | 1.47 |  |  |  | 1.00 |
Income per common share – diluted |  | $ | 1.43 |  |  | $ | 1.46 |  |  |  | 1.00 |
| (1) | Includes the dilutive impact of unvested restricted stock. |
| (2) | Using the treasury stock method, weighted average common shares outstanding for basic and diluted earnings per share excludes 1.9 million and 1.3 million shares issuable under the forward ATM equity offering and the forward equity offering outstanding during 2019 and 2017, respectively, as they would be anti-dilutive. |
Partnership Interest [Member] |
Schedule of earnings per share | The following summarizes the calculation of basic and diluted earnings per unit:
|  | Year ended December 31, |
(in thousands, except per share data) |  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to common unit holders - basic |  | $ | 240,064 |  |  | $ | 249,652 |  |  |  | 160,337 |
Income attributable to common unit holders - diluted |  | $ | 240,064 |  |  | $ | 249,652 |  |  |  | 160,337 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common units outstanding for basic EPU |  |  | 167,990 |  |  |  | 170,074 |  |  |  | 159,831 |
Weighted average common units outstanding for diluted EPU (1) (2) |  |  | 168,235 |  |  |  | 170,450 |  |  |  | 160,255 |
Income per common unit – basic |  | $ | 1.43 |  |  | $ | 1.47 |  |  |  | 1.00 |
Income per common unit – diluted |  | $ | 1.43 |  |  | $ | 1.46 |  |  |  | 1.00 |
| (1) | Includes the dilutive impact of unvested restricted stock. |
| (2) | Using the treasury stock method, weighted average common shares outstanding for basic and diluted earnings per share excludes 1.9 million and 1.3 million shares issuable under the forward ATM equity offering and the forward equity offering outstanding during 2019 and 2017, respectively, as they would be anti-dilutive. |

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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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