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Consolidated Variable Interest Entity (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) ft² | Sep. 30, 2020 USD ($) ft²
Consolidated Variable Interest Entity [Abstract] |  |
Rentable square feet of office property under development (in sq feet) | ft² |  | 1,200,000
Assets and liabilities of consolidated variable interest entity [Abstract] |  |
Development in-process | $ 172,706 | $ 258,219
Accounts payable, accrued expenses and other liabilities | $ 286,911 | 299,587
Consolidated Variable Interest Entity [Member] |  |
Consolidated Variable Interest Entity [Abstract] |  |
Rentable square feet of office property under development (in sq feet) | ft² | 150,000 |
Total anticipated development costs | $ 71,300 |
Contribution of cash to acquire interest in consolidated joint venture | $ 20,000 |
Interest in consolidated joint venture (in hundredths) | 80.00% |
Partner's contribution of property to acquire interest in consolidated joint venture | $ 5,000 |
Advance to consolidated affiliate | $ 46,300 |
Amount of loan funded to affiliate |  | 13,700
Assets and liabilities of consolidated variable interest entity [Abstract] |  |
Development in-process |  | 42,015
Accounts payable, accrued expenses and other liabilities |  | $ 2,706
Consolidated Variable Interest Entity [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Consolidated Variable Interest Entity [Abstract] |  |
Variable interest rate basis | LIBOR |
Interest rate, basis spread (in hundredths) | 2.50% |
Variable Interest Entity [Member] |  |
Consolidated Variable Interest Entity [Abstract] |  |
Partner's interest in consolidated joint venture (in hundredths) |  | 20.00%
Variable Interest Entity [Member] | Consolidated Variable Interest Entity [Member] |  |
Consolidated Variable Interest Entity [Abstract] |  |
Partner's interest in consolidated joint venture (in hundredths) | 20.00% |

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- Definition As of the balance sheet date: carrying value of obligations incurred and payable pertaining to goods and services received from vendors; and for statutory costs, are incurred in connection with contractual obligations, or accumulate over time and for which invoices haven't been received or rendered; and carrying amount of liabilities not otherwise specified in the taxonomy. Also serves as the sum of liabilities not individually reported in the financial statements, or not separately disclosed in notes. + References No definition available. + Details
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- Definition Consolidated Variable Interest Entities [Abstract] + References No definition available. + Details
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- Definition Represents equity interests of the parent in a subsidiary. + References No definition available. + Details
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- Definition Value of property contributed by our partner at the formation of the joint venture. + References No definition available. + Details
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- Definition The number of real estate properties under/planned for development as of the balance sheet date. + References No definition available. + Details
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- Definition Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.2) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 + Details
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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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