Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating real estate, consolidated variable interest entities	$ 1,997,583	$ 2,207,648
Construction-in-progress, consolidated variable interest entities	8,477	18,752
Accumulated depreciation and amortization, consolidated variable interest entities	362,921	389,950
Mortgages payable, consolidated variable interest entities	$ 191,827	$ 335,301
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred shares, par value	$ 0.01	$ 0.01
Common shares of beneficial interest, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	81,342,959	78,603,305
Common Stock, Shares, Outstanding	81,342,959	78,603,305
Federal Realty OP LP
Operating real estate, consolidated variable interest entities	$ 1,997,583	$ 2,207,648
Construction-in-progress, consolidated variable interest entities	8,477	18,752
Accumulated depreciation and amortization, consolidated variable interest entities	362,921	389,950
Mortgages payable, consolidated variable interest entities	$ 191,827	$ 335,301
Preferred units, issued	398,878	405,896
Preferred units, outstanding	398,878	405,896
Common unit, issued	81,342,959	78,603,305
Common unit, outstanding	81,342,959	78,603,305
5.417% Series 1 Cumulative Convertible Preferred
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, percentage	5.417%	5.417%
Preferred Stock, Liquidation Preference Per Share	$ 25	$ 25
Preferred Stock, Shares Issued	392,878	399,896
Preferred Stock, Shares Outstanding	392,878	399,896
5.0% Series C Cumulative Redeemable Preferred
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, percentage	5.00%	5.00%
Preferred Stock, Liquidation Preference Per Share	$ 25,000	$ 25,000
Preferred Stock, Shares Issued	6,000	6,000
Preferred Stock, Shares Outstanding	6,000	6,000