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
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Aug. 11, 2017
Deferred Charges, Goodwill And Other Assets [Line Items]      
Deferred leasing costs $ 154,093 $ 199,515  
Deferred financing costs - unsecured revolving credit facility 4,945 4,945  
Deferred charges, gross 159,038 204,460  
Accumulated amortization (63,837) (98,956)  
Deferred charges, net 95,201 105,504  
Notes receivable 51,898 50,167  
In-place lease values, related intangibles and other assets, net 93,818 102,757  
Goodwill 2,945 2,945  
Prepaid expenses and other assets, net 66,256 80,947  
Total deferred charges, goodwill and other assets, net 310,118 $ 342,320  
Net sales proceeds held by qualified intermediary $ 26,900    
Notes Receivable 5.85 Interest Rate [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Interest rate 5.85%    
Notes receivable $ 44,000   $ 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 $ 2,400    
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 Apr. 01, 2028