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Investments in Real Estate Partnerships - Schedule of Investments in Real Estate Partnerships (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) Property | Dec. 31, 2020 USD ($) Property | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of Properties | Property |  | 103 |  | 114 |  |
Total Investments |  | $ 372,591 |  | $ 467,155 |  |
Total assets of the Partnership |  | 10,792,563 |  | 10,936,904 |  |
The Company's Share of Net Income of the Partnership |  | 47,086 |  | 34,169 |  | $ 60,956
Net Income of the Partnership |  | 366,288 |  | 47,317 |  | $ 243,258
Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 2,755,444 |  | 3,067,227 |  |
Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 199,276 |  | $ 91,421 |  |
GRI - Regency, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 40.00% |  | 40.00% |  |
Number of Properties | Property |  | 67 |  | 67 |  |
Total Investments |  | $ 153,125 |  | $ 179,728 |  |
The Company's Share of Net Income of the Partnership |  | 34,655 |  | 25,425 |  |
GRI - Regency, LLC [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 1,537,411 |  | 1,583,097 |  |
GRI - Regency, LLC [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 78,112 |  | $ 56,244 |  |
New York Common Retirement Fund (NYC) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 30.00% |  | 30.00% | [1] |
Number of Properties | Property |  | 2 |  | 4 | [1] |
Total Investments |  | $ 11,688 |  | $ 27,627 | [1] |
The Company's Share of Net Income of the Partnership |  | 315 |  | 488 | [1] |
New York Common Retirement Fund (NYC) [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 82,446 |  | 205,332 | [1] |
New York Common Retirement Fund (NYC) [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 6,939 |  | $ 4,241 | [1] |
Columbia Regency Retail Partners, LLC (Columbia I) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 20.00% |  | 20.00% |  |
Number of Properties | Property |  | 7 |  | 7 |  |
Total Investments |  | $ 7,360 |  | $ 8,699 |  |
The Company's Share of Net Income of the Partnership |  | 1,976 |  | 1,030 |  |
Columbia Regency Retail Partners, LLC (Columbia I) [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 135,537 |  | 136,120 |  |
Columbia Regency Retail Partners, LLC (Columbia I) [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 10,256 |  | $ 5,383 |  |
Columbia Regency Partners II, LLC (Columbia II) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 20.00% |  | 20.00% |  |
Number of Properties | Property |  | 12 |  | 13 |  |
Total Investments |  | $ 35,251 |  | $ 37,882 |  |
The Company's Share of Net Income of the Partnership |  | 10,987 |  | 1,045 |  |
Columbia Regency Partners II, LLC (Columbia II) [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 352,469 |  | 377,246 |  |
Columbia Regency Partners II, LLC (Columbia II) [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 55,059 |  | $ 5,103 |  |
Columbia Village District, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 30.00% |  | 30.00% |  |
Number of Properties | Property |  | 1 |  | 1 |  |
Total Investments |  | $ 5,554 |  | $ 10,108 |  |
The Company's Share of Net Income of the Partnership |  | 1,522 |  | 757 |  |
Columbia Village District, LLC [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 94,536 |  | 94,551 |  |
Columbia Village District, LLC [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 5,131 |  | $ 2,531 |  |
RegCal, LLC (RegCal) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 25.00% |  | 25.00% |  |
Number of Properties | Property |  | 6 |  | 6 |  |
Total Investments |  | $ 24,995 |  | $ 25,908 |  |
The Company's Share of Net Income of the Partnership |  | 2,058 |  | 1,296 |  |
RegCal, LLC (RegCal) [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 103,587 |  | 107,283 |  |
RegCal, LLC (RegCal) [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 8,448 |  | $ 5,397 |  |
US Regency Retail I, LLC (USAA) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 20.01% | [2] | 20.01% | [3] |
Number of Properties | Property | [3] |  |  | 7 |  |
The Company's Share of Net Income of the Partnership |  | $ 631 | [2] | $ 790 | [3] |
US Regency Retail I, LLC (USAA) [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership | [3] |  |  | 85,006 |  |
US Regency Retail I, LLC (USAA) [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 3,155 | [2] | $ 3,948 | [3] |
Other Investments in Real Estate Partnerships [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of Properties | Property |  | 8 |  | 9 | [4] |
Total Investments |  | $ 134,618 |  | $ 177,203 | [4] |
The Company's Share of Net Income of the Partnership |  | (5,058) |  | 3,338 | [4] |
Other Investments in Real Estate Partnerships [Member] | Total Assets [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total assets of the Partnership |  | 449,458 |  | 478,592 | [4] |
Other Investments in Real Estate Partnerships [Member] | Net Income [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net Income of the Partnership |  | $ 32,176 |  | $ 8,574 | [4] |
Other Investments in Real Estate Partnerships [Member] | Minimum [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 35.00% |  | 35.00% | [4] |
Other Investments in Real Estate Partnerships [Member] | Maximum [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 50.00% |  | 50.00% | [4] |
[1] | On January 1, 2020, the Company purchased the partner's 70% interest of a property owned by the NYC partnership (Country Walk Plaza), as discussed in note 2, and therefore all earnings of this property are included in consolidated results from the date of acquisition and excluded from partnership earnings.
[2] | On August 1, 2021, the Company acquired the partner's 80% interest in the seven properties held in the USAA partnership and therefore all earnings of this property are included in consolidated results from the date of acquisition and excluded from partnership earnings. See note 2.
[3] | The USAA partnership has distributed proceeds from debt refinancing and real estate sales in excess of Regency’s carrying value of its investment, resulting in a negative investment balance of $4.4 million, which is recorded within Accounts Payable and other liabilities in the Consolidated Balance Sheets.
[4] | In January 2020, the Company purchased an additional 16.62% interest in Town and Country Shopping Center, bringing its total ownership interest to 35%.

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