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Investments in Real Estate Partnerships - Schedule of Investments in Real Estate Partnerships (Details) ratio in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Real Estate Partnerships, Number of Properties | property | 120 | 115 |
Investments in real estate partnerships | $ 463,001 | $ 386,304 |
Total Assets of the Partnership | 3,227,831 | 2,885,720 |
Net Income (Loss) of the Partnership | 129,085 | 139,958 | $ 161,047
Income (Loss) from Equity Method Investments | $ 42,974 | $ 43,341 | $ 56,518
GRI - Regency, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% | 0.00% |
Real Estate Partnerships, Number of Properties | property | 70 | 70 |
Investments in real estate partnerships | $ 189,381 | $ 198,521 |
Total Assets of the Partnership | 1,646,448 | 1,656,068 |
Net Income (Loss) of the Partnership | 74,139 | 69,211 |
Income (Loss) from Equity Method Investments | $ 29,614 | $ 27,440 |
Macquarie Country Wide - Regency Iii, Llc [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage |  | 0.00% |
Real Estate Partnerships, Number of Properties | property |  | 6 |
Investments in real estate partnerships |  | $ 53,277 |
Total Assets of the Partnership |  | 284,412 |
Net Income (Loss) of the Partnership |  | 2,757 |
Income (Loss) from Equity Method Investments |  | $ 686 |
Equity One JV Portfolio, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% |  |
Real Estate Partnerships, Number of Properties | property | 6 |  |
Investments in real estate partnerships | $ 54,250 |  |
Total Assets of the Partnership | 277,626 |  |
Net Income (Loss) of the Partnership | 2,239 |  |
Income (Loss) from Equity Method Investments | $ 490 |  |
Columbia Regency Retail Partners, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% | 0.00% |
Real Estate Partnerships, Number of Properties | property | 7 | 6 |
Investments in real estate partnerships | $ 13,625 | $ 7,057 |
Total Assets of the Partnership | 141,807 | 130,836 |
Net Income (Loss) of the Partnership | 6,650 | 18,233 |
Income (Loss) from Equity Method Investments | $ 1,311 | $ 3,620 |
Columbia Regency Partners II, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% | 0.00% |
Real Estate Partnerships, Number of Properties | property | 13 | 12 |
Investments in real estate partnerships | $ 38,110 | $ 13,720 |
Total Assets of the Partnership | 377,121 | 329,992 |
Net Income (Loss) of the Partnership | 23,367 | 7,690 |
Income (Loss) from Equity Method Investments | $ 4,673 | $ 1,530 |
Cameron Village, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% | 0.00% |
Real Estate Partnerships, Number of Properties | property | 1 | 1 |
Investments in real estate partnerships | $ 11,169 | $ 11,784 |
Total Assets of the Partnership | 98,633 | 99,808 |
Net Income (Loss) of the Partnership | 3,177 | 2,917 |
Income (Loss) from Equity Method Investments | $ 943 | $ 850 |
RegCal, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% | 0.00% |
Real Estate Partnerships, Number of Properties | property | 7 | 7 |
Investments in real estate partnerships | $ 31,235 | $ 27,829 |
Total Assets of the Partnership | 139,844 | 138,717 |
Net Income (Loss) of the Partnership | 6,167 | 5,613 |
Income (Loss) from Equity Method Investments | $ 1,542 | $ 1,403 |
US Regency Retail 1, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% | 0.00% |
Real Estate Partnerships, Number of Properties | property | 7 | 7 |
Investments in real estate partnerships | $ 0 | $ 0 |
Total Assets of the Partnership | 89,524 | 90,900 |
Net Income (Loss) of the Partnership | 4,685 | 22,299 |
Income (Loss) from Equity Method Investments | $ 937 | $ 4,456 |
Other Investments in Real Estate Partnerships [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage |  | 0.00% |
Real Estate Partnerships, Number of Properties | 0 | 0 |
Investments in real estate partnerships | $ 125,231 | $ 74,116 |
Total Assets of the Partnership | 456,828 | 154,987 |
Net Income (Loss) of the Partnership | 8,661 | 11,238 |
Income (Loss) from Equity Method Investments | $ 3,464 | $ 3,356 |
Minimum [Member] | Other Investments in Real Estate Partnerships [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% |  |
Maximum [Member] | Other Investments in Real Estate Partnerships [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Percentage | 0.00% |  |

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