Investments in Real Estate Partnerships - Schedule of Investments in Real Estate Partnerships (Details) $ in Thousands		12 Months Ended
		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%.