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Earnings Per Share / Unit (EPS / EPU) (Tables) | 12 Months Ended
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Dec. 31, 2020
Computation of Basic and Diluted Earnings Per Share / Unit | The computation of basic and diluted EPS of the Company is presented below:
| Year Ended December 31, 2020 |  | Year Ended December 31, 2019 |  | Year Ended December 31, 2018
Numerator: |  |  |  |  |
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders and Participating Securities | $ | 195,989 |  |  | $ | 238,775 |  |  | $ | 163,239 |
Net Income Allocable to Participating Securities | (314) |  |  | (518) |  |  | (513) |
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders | $ | 195,675 |  |  | $ | 238,257 |  |  | $ | 162,726 |
Denominator (In Thousands): |  |  |  |  |
Weighted Average Shares - Basic | 127,711 |  |  | 126,392 |  |  | 123,804 |
Effect of Dilutive Securities: |  |  |  |  |
Performance Units (See Note 11) | 193 |  |  | 299 |  |  | 387 |
Weighted Average Shares - Diluted | 127,904 |  |  | 126,691 |  |  | 124,191 |
Basic EPS: |  |  |  |  |
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders | $ | 1.53 |  |  | $ | 1.89 |  |  | $ | 1.31 |
Diluted EPS: |  |  |  |  |
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders | $ | 1.53 |  |  | $ | 1.88 |  |  | $ | 1.31 |
First Industrial, L.P. |
Computation of Basic and Diluted Earnings Per Share / Unit | The computation of basic and diluted EPU of the Operating Partnership is presented below:
| Year Ended December 31, 2020 |  | Year Ended December 31, 2019 |  | Year Ended December 31, 2018
Numerator: |  |  |  |  |
Net Income Available to Unitholders and Participating Securities | $ | 199,934 |  |  | $ | 243,628 |  |  | $ | 167,246 |
Net Income Allocable to Participating Securities | (662) |  |  | (732) |  |  | (513) |
Net Income Available to Unitholders | $ | 199,272 |  |  | $ | 242,896 |  |  | $ | 166,733 |
Denominator (In Thousands): |  |  |  |  |
Weighted Average Units - Basic | 129,752 |  |  | 128,831 |  |  | 126,921 |
Effect of Dilutive Securities that Result in the Issuance of General Partner Units: |  |  |  |  |
Performance Units and certain Performance RLP Units (See Note 11) | 375 |  |  | 410 |  |  | 387 |
Weighted Average Units - Diluted | 130,127 |  |  | 129,241 |  |  | 127,308 |
Basic EPU: |  |  |  |  |
Net Income Available to Unitholders | $ | 1.54 |  |  | $ | 1.89 |  |  | $ | 1.31 |
Diluted EPU: |  |  |  |  |
Net Income Available to Unitholders | $ | 1.53 |  |  | $ | 1.88 |  |  | $ | 1.31 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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