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Investments In and Advances To Affiliates Consolidated Variable Interest Entity (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) ft² | Dec. 31, 2020 USD ($) ft² | Dec. 31, 2018 USD ($)
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 | $ 259,681 | $ 165,537
Deferred leasing costs | 231,347 | 209,329 |
Prepaid expenses and other assets | 58,996 | 62,885 |
Accounts payable, accrued expenses and other liabilities | $ 286,911 | $ 268,727 |
Ownership Percentage [Member] |  |  |
Consolidated Variable Interest Entity [Abstract] |  |  |
Partner's interest in consolidated joint venture (in hundredths) |  | 50.00% |
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 |  |
Percentage of equity interest in consolidated affiliates | 80.00% |  |
Partner's contribution of property to acquire interest in consolidated joint venture | $ 5,000 |  |
Advance to consolidated affiliate | $ 46,300 |  |
Interest rate, basis spread (in hundredths) | 2.50% |  |
Amount of loan funded to affiliate |  | $ 18,500 |
Assets and liabilities of consolidated variable interest entity [Abstract] |  |  |
Development in-process |  | 46,873 |
Deferred leasing costs |  | 196 |
Prepaid expenses and other assets |  | 75 |
Accounts payable, accrued expenses and other liabilities |  | $ 2,693 |
Consolidated Variable Interest Entity [Member] | Ownership Percentage [Member] |  |  |
Consolidated Variable Interest Entity [Abstract] |  |  |
Partner's interest in consolidated joint venture (in hundredths) | 20.00% | 20.00% |
London Interbank Offered Rate (LIBOR) [Member] | Consolidated Variable Interest Entity [Member] |  |  |
Consolidated Variable Interest Entity [Abstract] |  |  |
Interest rate basis | LIBOR |  |

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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 Amount of advance to affiliate that has been funded. + References No definition available. + Details
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- Definition Total estimated cost to construct development property. + 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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