Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details)
|
3 Months Ended |
|
|
Mar. 31, 2020
USD ($)
property
item
|
Dec. 31, 2019
USD ($)
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
| Fair value of Company's long-term debt |
$ 2,919,633,000
|
$ 2,791,629,000
|
| Principal balance outstanding |
2,877,121,000
|
$ 2,808,517,000
|
| Unrealized losses on rental properties held for sale |
(7,915,000)
|
|
| Properties aggregate net book value |
898,000,000
|
|
| Land and other Impairments |
5,263,000
|
|
| Parsippany, Madison, Short Hills, Edison, Red Bank, and Florhan Park [Member] |
|
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
| Unrealized losses on rental properties held for sale |
53,000,000.0
|
|
| Land and other Impairments |
$ 5,300,000
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, Red Bank, and Florhan Park [Member] |
|
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
| Number of properties held for sale | property |
20
|
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| Number of disposal groups | item |
4
|
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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] |
|
|
| Number of properties held for sale | property |
34
|
|
| Number of disposal groups | property |
12
|
|
| 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
|
|
| Disposal Group, Not Discontinued Operations [Member] |
|
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
| Unrealized losses on rental properties held for sale |
$ (45,068,000)
|
|
| Discontinued Operations [Member] | Parsippany, Madison, Short Hills, Edison, Red Bank, and Florhan Park [Member] |
|
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
|
| Unrealized losses on rental properties held for sale |
45,100,000
|
|
| Land and other Impairments |
$ 5,300,000
|
|