Earnings Per Share And Unit (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 64,499	$ 63,461	$ 291,033	$ 236,132
Dividends on preferred shares	(2,008)	(2,008)	(6,024)	(6,024)
Less: Income from operations attributable to noncontrolling interests	(2,850)	(2,508)	(9,700)	(6,461)
Earnings Allocated To Unvested Shares	(324)	(325)	(964)	(988)
Net income available for common shareholders, basic	59,317	58,620	274,345	222,659
Net income available for common shareholders, diluted	$ 59,317	$ 58,620	$ 274,345	$ 222,659
Weighted average number of common shares, Basic	85,978	83,994	85,808	83,180
Weighted average number of common shares, Diluted	85,978	83,994	85,808	83,180
Net income available for common shareholders, Basic	$ 0.69	$ 0.70	$ 3.20	$ 2.68
Net income available for common shareholders, Diluted	$ 0.69	$ 0.70	$ 3.20	$ 2.68
Federal Realty OP LP
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 64,499	$ 63,461	$ 291,033	$ 236,132
Distributions on preferred units	(2,008)	(2,008)	(6,024)	(6,024)
Less: Income from operations attributable to noncontrolling interests	(2,850)	(2,508)	(9,700)	(6,461)
Earnings allocated to unvested units	(324)	(325)	(964)	(988)
Net income available for common unit holders, basic	59,317	58,620	274,345	222,659
Net income available for common unit holders, diluted	$ 59,317	$ 58,620	$ 274,345	$ 222,659
Weighted average number of common units, Basic	85,978	83,994	85,808	83,180
Weighted average common units outstanding, diluted	85,978	83,994	85,808	83,180
Net income available for common unit holders, Basic	$ 0.69	$ 0.70	$ 3.20	$ 2.68
Net income available for common unit holders, Diluted	$ 0.69	$ 0.70	$ 3.20	$ 2.68