Noncontrolling Interests In Subsidiaries (Schedule Of Activity Of Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Noncontrolling Interest [Line Items]
Balance, value			$ 193,563
Common unit distributions		$ (2,029)	643	$ (3,509)
Redeemable noncontrolling interests	$ (6,471)	(6,471)	(19,413)	(19,413)
Redemption of common units, value	(295)	(29)	(11,164)	(2,170)
Other comprehensive income (loss)				(16)
Balance, value	171,047		171,047
Noncontrolling Interests In Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Balance, value	175,107	194,463	193,563	205,776
Net income	2,522	1,090	6,468	5,123
Common unit distributions		(2,029)	643	(3,509)
Redeemable noncontrolling interests	(6,626)	(6,701)	(19,902)	(20,176)
Change in noncontrolling interests in consolidated joint ventures	12		197	133
Redemption of common units for common stock			(2,716)
Redemption of common units, value	(295)	(29)	(11,164)	(2,170)
Stock compensation	1,275	329	4,462	4,534
Cancellation of unvested LTIP units				(201)
Other comprehensive income (loss)				(34)
Rebalancing of ownership percentage between parent and subsidiaries	(948)	875	(504)	(1,478)
Balance, value	$ 171,047	$ 187,998	$ 171,047	$ 187,998