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Dispositions of Real Estate and Discontinued Operations - Assets and Liabilities for Discontinued Operations (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Real estate: |  |  |  |
Cash and cash equivalents | $ 40,161 | $ 53,085 | $ 66,791 | $ 63,834
Restricted cash | 5,817 | 17,168 | $ 21,576 | $ 27,040
Intangible assets, net | 9,000 | 25,000 |  |
Total assets of discontinued operations, net | 1,374,507 | 2,626,306 |  |
LIABILITIES |  |  |  |
Total liabilities of discontinued operations, net | 328,167 | 415,737 |  |
Allowance for doubtful accounts receivable | 5,132 | 5,873 |  |
Deferred revenue | 765,946 | 774,316 |  |
Held-for-sale |  |  |  |
Real estate: |  |  |  |
Buildings and improvements | 1,174,263 | 2,553,254 |  |
Development costs and construction in progress | 11,136 | 21,509 |  |
Land | 201,699 | 355,803 |  |
Accumulated depreciation and amortization | (221,246) | (615,708) |  |
Net real estate | 1,165,852 | 2,314,858 |  |
Investments in and advances to unconsolidated joint ventures | 5,776 | 5,842 |  |
Accounts receivable, net of allowance of $5,132 and $5,873 | 13,976 | 20,500 |  |
Cash and cash equivalents | 40,161 | 53,085 |  |
Restricted cash | 5,817 | 17,168 |  |
Intangible assets, net | 8,539 | 24,541 |  |
Right-of-use asset, net | 937 | 4,109 |  |
Other assets, net(1) | 43,224 | 103,965 |  |
Total assets of discontinued operations, net | 1,284,282 | 2,544,068 |  |
Total medical office assets held for sale, net | 90,225 | 82,238 |  |
Assets held for sale and discontinued operations, net | 1,374,507 | 2,626,306 |  |
LIABILITIES |  |  |  |
Mortgage debt | 278,172 | 318,876 |  |
Lease liability | 935 | 3,189 |  |
Accounts payable, accrued liabilities, and other liabilities | 41,977 | 79,411 |  |
Deferred revenue | 3,985 | 11,442 |  |
Total liabilities of discontinued operations, net | 325,069 | 412,918 |  |
Total liabilities related to medical office assets held for sale, net | 3,098 | 2,819 |  |
Liabilities related to assets held for sale and discontinued operations, net | 328,167 | 415,737 |  |
Goodwill | 29,000 | 29,000 |  |
Net real estate assets | 81,000 | 73,000 |  |
Deferred revenue | $ 2,000 | $ 2,000 |  |

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