Earnings Per Share And Unit (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net income	$ 114,655	$ 63,004	$ 172,671	$ 120,735
Less: Preferred share dividends	(2,008)	(2,008)	(4,016)	(4,016)
Less: Income from operations attributable to noncontrolling interests	(2,673)	(2,505)	(3,953)	(4,901)
Less: Earnings allocated to unvested shares	(399)	(324)	(663)	(651)
Net income available for common shareholders, basic	109,575	58,167	164,039	111,167
Add: Income attributable to downREIT operating partnership units	686	0	0	0
Net income available for common shareholders, diluted	$ 110,261	$ 58,167	$ 164,039	$ 111,167
Weighted average common shares outstanding, basic	82,932	81,214	82,768	81,178
DownREIT operating partnership units	631	0	0	0
Weighted average common shares outstanding, diluted	83,563	81,214	82,768	81,178
EARNINGS PER COMMON SHARE, BASIC AND DILUTED:
Net income available for common shareholders, Basic	$ 1.32	$ 0.72	$ 1.98	$ 1.37
Net income available for common shareholders, Diluted	$ 1.32	$ 0.72	$ 1.98	$ 1.37
Federal Realty OP LP
Net income	$ 114,655	$ 63,004	$ 172,671	$ 120,735
Less: Preferred unit distributions	(2,008)	(2,008)	(4,016)	(4,016)
Less: Income from operations attributable to noncontrolling interests	(2,673)	(2,505)	(3,953)	(4,901)
Less: Earnings allocated to unvested units	(399)	(324)	(663)	(651)
Net income available for common unit holders, basic	109,575	58,167	164,039	111,167
Add: Income attributable to downREIT operating partnership units	686	0	0	0
Net income available for common unit holders, diluted	$ 110,261	$ 58,167	$ 164,039	$ 111,167
Weighted average common units outstanding, basic	82,932	81,214	82,768	81,178
DownREIT operating partnership units	631	0	0	0
Weighted average common units outstanding, diluted	83,563	81,214	82,768	81,178
EARNINGS PER COMMON UNIT, BASIC AND DILUTED:
Net income available for common unit holders, Basic	$ 1.32	$ 0.72	$ 1.98	$ 1.37
Net income available for common unit holders, Diluted	$ 1.32	$ 0.72	$ 1.98	$ 1.37