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Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |
Document Fiscal Year Focus | 2018 |
Investment in real estate, net | $ 3,001,481 | $ 2,682,578
Acquired lease intangible assets, net | 57,053 | 54,021
Other assets | 169,297 | 149,121
Total assets | 3,227,831 | 2,885,720
Notes payable | 1,609,647 | 1,514,729
Acquired lease intangible liabilities, net | 49,501 | 42,466
Other liabilities | 90,577 | 70,498
Capital - Regency | 498,852 | 445,068
Capital - Third parties | 979,254 | 812,959
Total liabilities and capital | 3,227,831 | 2,885,720
Investments in real estate partnerships (note 4) | 463,001 | 386,304
Impairment Losses Related to Real Estate Partnerships | (1,300) | (1,300)
US Regency Retail 1, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total assets | 89,524 | 90,900
Investments in real estate partnerships (note 4) | 0 | 0
Basis Difference [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | (38,064) | (37,852)
Restricted Gain Method Deferral [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 0 | (30,902)
Other Liabilities [Member] | US Regency Retail 1, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate partnerships (note 4) | $ 3,513 | $ 11,290

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