Quarterly report pursuant to Section 13 or 15(d)

Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details)

v3.21.2
Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
property
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
property
Sep. 30, 2020
USD ($)
Oct. 31, 2021
ft²
Dec. 31, 2020
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Fair value of Company's long-term debt $ 2,399,631,000     $ 2,399,631,000     $ 2,879,002,000
Principal balance outstanding 2,374,947,000     2,374,947,000     $ 2,801,797,000
Unrealized gains (losses) on real estate held for sale       (3,485,000)      
Properties aggregate net book value       497,800,000      
Land and other impairments, net 3,401,000 $ 1,292,000   11,333,000 $ 23,401,000    
Provision for Loan and Lease Losses       5,152,000      
Land Parcels [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Land and other impairments, net $ 6,800,000     14,300,000      
Metropark Portfolio [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Provision for Loan and Lease Losses       $ 5,200,000      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Number of properties held for sale | property 2     2      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jersey City, New Jersey [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Number of properties held for sale | property 2     2      
Unrealized gains (losses) on real estate held for sale $ 3,000,000.0     $ 3,500,000      
Properties aggregate net book value       193,800,000      
Land and other impairments, net $ 300,000     $ 700,000      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Number of properties held for sale | property 3     3      
Number of disposal groups | property       3      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Retail Property [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Number of properties held for sale | property 1     1      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land Parcels [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Unrealized gains (losses) on real estate held for sale $ 3,700,000     $ 3,700,000      
Properties aggregate net book value 24,600,000     24,600,000      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land Parcels [Member] | Hoboken, New Jersey [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Properties aggregate net book value       60,000,000.0      
Land and other impairments, net 6,800,000     14,300,000      
Disposal Group, Not Discontinued Operations [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Unrealized gains (losses) on real estate held for sale       439,000      
Gain (loss) on sale of property       25,030,000      
Disposal Group, Not Discontinued Operations [Member] | Hoboken, New Jersey [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Property impairments     $ 6,000,000.0        
Discontinued Operations [Member] | Jersey City, New Jersey [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Unrealized gains (losses) on real estate held for sale $ 3,700,000     $ 3,700,000      
Subsequent Event [Member] | Disposal Group, Not Discontinued Operations [Member] | Office [Member]              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Area of property (in square feet) | ft²           248,480