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Equity and Noncontrolling Interest Equity Weighted Average Shares Outstanding (Tables) | 12 Months Ended
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Dec. 31, 2020
Noncontrolling Interest [Abstract] |
Schedule of Weighted Average Number of Shares | Per share data for net income (basic and diluted) is computed using weighted average shares of common stock. Convertible limited partnership units and employee stock options are the Company’s potentially dilutive securities. For all periods presented, the convertible limited partnership units are anti-dilutive. The treasury stock method was used to measure the effect of the dilution.
| December 31,
(Shares in thousands) | 2020 |  | 2019 |  | 2018
Weighted average common shares outstanding - Basic | 23,356 |  |  | 23,009 |  |  | 22,383 |
Effect of dilutive options | 1 |  |  | 44 |  |  | 42 |
Weighted average common shares outstanding - Diluted | 23,357 |  |  | 23,053 |  |  | 22,425 |
Average share price | $ | 33.84 |  |  | $ | 53.41 |  |  | $ | 52.50 |
Non-dilutive options | 1,439 |  |  | 633 |  |  | 492 |
Years non-dilutive options were issued | 2014 through 2020 |  | 2016, 2017 and 2019 |  | 2015, 2016 and 2017

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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