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EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
BASIC EPS COMPUTATION FOR NET INCOME AVAILABLE TO EASTGROUP PROPERTIES, INC. COMMON STOCKHOLDERS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator - net income available to common stockholders | $ 18,556 |  | $ 23,010 |  | $ 18,227 |  | $ 28,713 |  | $ 17,590 |  | $ 15,884 |  | $ 36,890 |  | $ 12,819 |  | $ 88,506 | $ 83,183 | $ 95,509
Denominator - weighted average shares outstanding (in shares) | 36,135 | [1] | 35,716 | [1] | 35,196 | [1] | 34,689 | [1] | 34,406 | [1] | 34,215 | [1] | 33,987 | [1] | 33,361 | [1] | 35,439 | 33,996 | 32,563
DILUTED PER COMMON SHARE DATA FOR NET INCOME ATTRIBUTABLE TO EASTGROUP PROPERTIES, INC. COMMON STOCKHOLDERS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator - net income available to common stockholders | $ 18,556 |  | $ 23,010 |  | $ 18,227 |  | $ 28,713 |  | $ 17,590 |  | $ 15,884 |  | $ 36,890 |  | $ 12,819 |  | $ 88,506 | $ 83,183 | $ 95,509
Denominator: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding | 36,135 | [1] | 35,716 | [1] | 35,196 | [1] | 34,689 | [1] | 34,406 | [1] | 34,215 | [1] | 33,987 | [1] | 33,361 | [1] | 35,439 | 33,996 | 32,563
Unvested restricted stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67 | 51 | 65
Total Shares (in shares) | 36,232 | [1] | 35,798 | [1] | 35,259 | [1] | 34,736 | [1] | 34,505 | [1] | 34,290 | [1] | 34,040 | [1] | 33,409 | [1] | 35,506 | 34,047 | 32,628
[1] | The above quarterly earnings per share calculations are based on the weighted average number of shares of common stock outstanding during each quarter for basic earnings per share and the weighted average number of outstanding shares of common stock and common stock share equivalents during each quarter for diluted earnings per share. The annual earnings per share calculations in the Consolidated Statements of Income and Comprehensive Income are based on the weighted average number of shares of common stock outstanding during each year for basic earnings per share and the weighted average number of outstanding shares of common stock and common stock share equivalents during each year for diluted earnings per share. The sum of quarterly financial data may vary from the annual data due to rounding.

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1377-109256 + Details
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