Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details)
|
3 Months Ended |
9 Months Ended |
|
|
Sep. 30, 2020
USD ($)
property
item
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Sep. 30, 2019
USD ($)
|
Sep. 30, 2020
USD ($)
item
property
|
Sep. 30, 2019
USD ($)
|
Dec. 31, 2019
USD ($)
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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|
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| Fair value of Company's long-term debt |
$ 2,963,488,000
|
|
$ 2,963,488,000
|
|
$ 2,791,629,000
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| Principal balance outstanding |
2,895,882,000
|
|
2,895,882,000
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|
$ 2,808,517,000
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| Unrealized losses on rental properties held for sale |
|
|
(7,915,000)
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| Properties aggregate net book value |
|
|
714,400,000
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| Land and other impairments |
1,292,000
|
$ 2,589,000
|
23,401,000
|
$ 5,088,000
|
|
| Property impairments |
36,582,000
|
|
36,582,000
|
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| Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
|
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| Unrealized losses on rental properties held for sale |
0
|
|
41,200,000
|
|
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| Land and other impairments |
$ 1,300,000
|
|
$ 23,400,000
|
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| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Number of properties held for sale | property |
10
|
|
10
|
|
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| Number of disposal groups | item |
|
|
5
|
|
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| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Number of properties held for sale | property |
21
|
|
21
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| Number of disposal groups | property |
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|
12
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| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Retail Property [Member] |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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|
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| Number of properties held for sale | property |
1
|
|
1
|
|
|
| Disposal Group, Not Discontinued Operations [Member] |
|
|
|
|
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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|
|
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| Unrealized losses on rental properties held for sale |
|
|
$ (33,314,000)
|
|
|
| Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] |
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|
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
|
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| Unrealized losses on rental properties held for sale |
$ 0
|
|
33,300,000
|
|
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| Land and other impairments |
$ 1,300,000
|
|
$ 23,400,000
|
|
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| Development [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Number of properties held for sale | item |
2
|
|
2
|
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