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Investments In and Advances To Affiliates Consolidated Variable Interest Entity (Details) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Consolidated Variable Interest Entity [Abstract] |  |  |  |
Rentable square feet of office property under development (in sq feet) | ft² |  | 1,200,000 |  |
Partner's interest in consolidated joint venture (in hundredths) |  | 50.00% |  |
Assets and liabilities of consolidated variable interest entity [Abstract] |  |  |  |
Development in-process |  | $ 172,706 | $ 165,537 | $ 88,452
Accounts payable, accrued expenses and other liabilities |  | 286,911 | $ 218,922 |
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 |  |  |
Contributions funded to acquire interest in consolidated joint venture |  | 15,900 |  |
Percentage of equity interest in consolidated affiliates | 80.00% |  |  |
Partner's contribution of property to acquire interest in consolidated joint venture | $ 5,000 |  |  |
Partner's interest in consolidated joint venture (in hundredths) | 20.00% |  |  |
Advance to consolidated affiliate | $ 46,300 |  |  |
Assets and liabilities of consolidated variable interest entity [Abstract] |  |  |  |
Development in-process |  | 22,380 |  |
Accounts payable, accrued expenses and other liabilities |  | $ 1,162 |  |
London Interbank Offered Rate (LIBOR) [Member] | Consolidated Variable Interest Entity [Member] |  |  |  |
Consolidated Variable Interest Entity [Abstract] |  |  |  |
Interest rate basis | LIBOR plus 250 basis points |  |  |
Interest rate, basis spread (in hundredths) | 2.50% |  |  |

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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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