Quarterly report pursuant to Section 13 or 15(d)

Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details)

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Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Aug. 11, 2017
Deferred Charges, Goodwill And Other Assets [Line Items]      
Deferred leasing costs $ 170,672 $ 199,515  
Deferred financing costs - unsecured revolving credit facility 5,328 4,945  
Deferred charges, net 176,000 204,460  
Accumulated amortization (67,896) (98,956)  
Deferred charges, net 108,104 105,504  
Notes receivable 50,910 50,167  
In-place lease values, related intangibles and other assets, net 95,652 102,757  
Goodwill 2,945 2,945  
Prepaid expenses and other assets, net 83,346 80,947  
Total deferred charges, goodwill and other assets, net $ 340,957 $ 342,320  
Notes Receivable 5.85 Interest Rate [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Interest rate 5.85%    
Notes receivable $ 44,600   $ 44,700
Loan extension period 3 months    
Mortgage loan, maturity date Jul. 01, 2019    
Interest-Free Notes Receivable [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Notes receivable $ 2,300    
Mortgage loan, maturity date Apr. 01, 2023    
Disposal Group, Not Discontinued Operations [Member] | Buyer [Member] | Notes Receivable 3.0 Interest Rate [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Interest rate 3.00%    
Notes receivable $ 4,000    
Mortgage loan, maturity date Oct. 01, 2018