Deferred Charges, Goodwill And Other Assets (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Deferred Charges, Goodwill And Other Assets [Line Items]
Deferred leasing costs	$ 226,649			$ 239,138
Deferred financing costs	20,755			24,042
Deferred charges, gross	247,404			263,180
Accumulated amortization	(107,601)			(122,358)
Deferred charges, net	139,803			140,822
Notes receivable	21,430	[1]		21,491	[1]
In-place lease values, related intangible and other assets, net	6,021			6,565
Goodwill	2,945			2,945
Prepaid expenses and other assets, net	40,561			32,827
Total deferred charges, goodwill and other assets	210,760			204,650
Lease revenue	123,793		134,051
Mortgage Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable	10,400
Spread over LIBOR	6.00%
8% Notes Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable	7,800
Interest rate	8.00%
Interest-Free Notes Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable	$ 3,300

[1] Includes as of March 31, 2015: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent and matures in August 2015; a note receivable for $7.8 million which bears interest at eight percent and matures in October 2017 (which was repaid in full to the Company on April 15, 2015); and an interest-free note receivable with a net present value of $3.3 million and matures in April 2023. The Company believes these balances are fully collectible.