Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Deferred Charges, Goodwill And Other Assets [Line Items]    
Deferred leasing costs $ 237,209 $ 239,690
Deferred financing costs - revolving credit facility [1] 5,359 5,394
Deferred charges, gross 242,568 245,084
Accumulated amortization (103,316) (118,014)
Deferred charges, net 139,252 127,070
Notes receivable [2] 13,435 13,496
In-place lease values, related intangibles and other assets, net 12,736 10,931
Goodwill 2,945 2,945
Prepaid expenses and other assets, net [3] 52,629 49,408
Total deferred charges, goodwill and other assets, net 220,997 $ 203,850
Acquisition-related Costs [Member]    
Deferred Charges, Goodwill And Other Assets [Line Items]    
Deposits for acquisitions and developments 12,700  
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 $ 3,000  
Mortgage loan, maturity date Apr. 01, 2023  
[1] Pursuant to recently issued accounting standards, deferred financing costs related to all other debt liabilities (other than for the revolving credit facility) are classified to net against those debt liabilities for all periods presented. See Note 2: Significant Accounting Policies - Deferred Financing Costs.
[2] Includes as of March 31, 2016: 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 $3.0 million and matures in April 2023. The Company believes these balances are fully collectible.
[3] Includes as of March 31, 2016, deposits of $12.7 million for acquisitions and developments.