Deferred Charges, Goodwill And Other Assets (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Mortgage Receivable [Member]
Jun. 30, 2014
8% Notes Receivable [Member]
Jun. 30, 2014
3.5% Notes Receivable [Member]
Jun. 30, 2014
Interest-Free Notes Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]            
Deferred leasing costs $ 227,930 $ 258,648        
Deferred financing costs 21,916 25,366        
Deferred charges, gross 249,846 284,014        
Accumulated amortization (112,249) (131,669)        
Deferred charges, net 137,597 152,345        
Notes receivable 83,889 [1] 21,986 [1] 10,400 7,800 62,300 3,400
In-place lease values, related intangible and other assets, net 9,515 13,659        
Goodwill 2,945 2,945        
Prepaid expenses and other assets, net 32,814 27,584        
Total deferred charges, goodwill and other assets $ 266,760 $ 218,519        
Spread over LIBOR     6.00%      
Interest rate       8.00% 3.50%  
[1] Includes: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent; a note receivable for $7.8 million which bears interest at eight percent; notes receivable for $62.3 million which bear interest at 3.5 percent (See Note 4: Unconsolidated joint ventures - Recent Transactions); and an interest-free note r