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Consolidated Variable Interest Entity (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) ft² | Mar. 31, 2021 USD ($) ft² | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Consolidated Variable Interest Entity [Abstract] |  |  |  |
Rentable square feet of office property under development (in sq feet) | ft² |  | 800,000 |  |
Assets and liabilities of consolidated variable interest entity [Abstract] |  |  |  |
Development in-process |  | $ 288,406 | $ 259,681 |
Cash and cash equivalents |  | 49,279 | 109,322 | $ 12,696
Deferred leasing costs |  | 219,790 | 209,329 |
Prepaid expense and other assets |  | 72,845 | 62,885 |
Accounts payable, accrued expenses and other liabilities |  | 258,026 | $ 268,727 |
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 |  | 21,100 |  |
Assets and liabilities of consolidated variable interest entity [Abstract] |  |  |  |
Development in-process |  | 49,039 |  |
Cash and cash equivalents |  | 85 |  |
Deferred leasing costs |  | 196 |  |
Prepaid expense and other assets |  | 127 |  |
Accounts payable, accrued expenses and other liabilities |  | $ 2,127 |  |
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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