Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Deferred Charges, Goodwill And Other Assets [Line Items]        
Deferred leasing costs $ 112,421 $ 142,424    
Deferred financing costs - unsecured revolving credit facility 5,559 5,559    
Deferred charges, gross 117,980 147,983    
Accumulated amortization (52,428) (59,522)    
Deferred charges, net 65,552 88,461    
Notes receivable 1,167 1,625    
In-place lease values, related intangibles and other assets, net 71,608 86,092    
Goodwill 2,945 2,945    
Right of use assets 22,298 22,604    
Prepaid expenses and other assets, net 35,971 73,375    
Total deferred charges, goodwill and other assets, net 199,541 275,102    
Liability       $ 23,600
Revenue from leases 272,970 302,409 $ 323,793  
Acquired Above And Below Market Lease Intangibles [Member]        
Deferred Charges, Goodwill And Other Assets [Line Items]        
Revenue from leases 3,700 4,300 $ 5,300  
Acquisition-related Costs [Member]        
Deferred Charges, Goodwill And Other Assets [Line Items]        
Net sales proceeds held by qualified intermediary $ 0 28,100    
Interest-Free Notes Receivable [Member]        
Deferred Charges, Goodwill And Other Assets [Line Items]        
Mortgage loan, maturity month and year April 2023      
Mortgage receivable $ 1,200 1,600    
Discontinued Operations [Member]        
Deferred Charges, Goodwill And Other Assets [Line Items]        
Total deferred charges, goodwill and other assets, net $ 42,500 $ 68,600