Discontinued Operations (Narrative) (Details)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
21 Months Ended |
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Oct. 31, 2020
USD ($)
ft²
property
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Sep. 30, 2020
USD ($)
ft²
property
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Sep. 30, 2019
USD ($)
|
Sep. 30, 2020
USD ($)
ft²
item
property
|
Sep. 30, 2019
USD ($)
|
Sep. 30, 2020
USD ($)
ft²
property
|
Dec. 19, 2019
ft²
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Unrealized losses on disposition of rental property |
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$ (10,063,000)
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$ (33,314,000)
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$ (15,865,000)
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| Suburban Office Portfolio [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Area of property (in square feet) | ft² |
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6,600,000
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| Four Disposal Group [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of disposal groups | item |
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5
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| Properties | property |
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10
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| Unrealized losses on disposition of rental property |
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$ 0
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$ 33,300,000
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| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of disposal groups | item |
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12
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| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Properties Disposed One [Member] | Suburban Office Portfolio [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of real estate properties | property |
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21
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21
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21
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| Area of property (in square feet) | ft² |
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4,000,000
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4,000,000
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4,000,000
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| Disposal Group, Not Discontinued Operations [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of properties sold | item |
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14
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| Sales proceeds |
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$ 242,645,000
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| Gain (loss) on sale of property |
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$ 9,414,000
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| Disposal Group, Not Discontinued Operations [Member] | Suburban Office Portfolio [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of properties sold | property |
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16
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| Sales proceeds |
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$ 294,800,000
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| Area of property (in square feet) | ft² |
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2,600,000
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2,600,000
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2,600,000
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| Disposal Group, Not Discontinued Operations [Member] | Properties Disposed Two [Member] | Suburban Office Portfolio [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of real estate properties | property |
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10
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|
10
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|
10
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| Area of property (in square feet) | ft² |
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1,900,000
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1,900,000
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1,900,000
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| Gain (loss) on sale of property |
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$ 407,500,000
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| Subsequent Event [Member] | Disposal Group, Not Discontinued Operations [Member] | Properties Disposed Three [Member] | Suburban Office Portfolio [Member] |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Number of properties sold | property |
1
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| Area of property (in square feet) | ft² |
98,500
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| Gain (loss) on sale of property |
$ 7,500,000
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