Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Deferred Charges, Goodwill And Other Assets [Line Items]
Deferred leasing costs		$ 229,989	$ 239,138
Deferred financing costs		20,823	24,042
Deferred charges, gross		250,812	263,180
Accumulated amortization		(113,469)	(122,358)
Deferred charges, net		137,343	140,822
Notes receivable	[1]	13,619	21,491
In-place lease values, related intangibles and other assets, net		5,458	6,565
Goodwill		2,945	2,945
Prepaid expenses and other assets, net		38,408	32,827
Total deferred charges, goodwill and other assets		197,773	$ 204,650
Mortgage Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable		$ 10,400
Spread over LIBOR		6.00%
Mortgage loan, maturity date		Aug. 01, 2016
Interest-Free Notes Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable		$ 3,200
Mortgage loan, maturity date		Apr. 01, 2023

[1] Includes as of June 30, 2015: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent and matures in August 2016; and an interest-free note receivable with a net present value of $3.2 million and matures in April 2023. The Company believes these balances are fully collectible.