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Dispositions of Real Estate and Discontinued Operations - Assets and Liabilities for Discontinued Operations (Details) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Real estate: |  |  |  |
Cash and cash equivalents | $ 7,707,000 | $ 53,085,000 | $ 63,834,000 | $ 56,811,000
Restricted cash | 0 | 17,168,000 | $ 27,040,000 | $ 21,890,000
Intangible assets, net | 0 | 25,000,000 |  |
Total assets of discontinued operations, net | 37,190,000 | 2,626,306,000 |  |
LIABILITIES |  |  |  |
Total liabilities of discontinued operations, net | 15,056,000 | 415,737,000 |  |
Allowance for doubtful accounts receivable | 4,138,000 | 5,873,000 |  |
Goodwill | 18,000,000 | 18,000,000 |  |
Right-of-use asset, net | 233,942,000 | 192,349,000 |  |
Deferred revenue | 789,207,000 | 774,316,000 |  |
Held-for-sale |  |  |  |
Real estate: |  |  |  |
Buildings and improvements | 0 | 2,553,254,000 |  |
Development costs and construction in progress | 0 | 21,509,000 |  |
Land | 0 | 355,803,000 |  |
Accumulated depreciation and amortization | 0 | (615,708,000) |  |
Net real estate | 0 | 2,314,858,000 |  |
Investments in and advances to unconsolidated joint ventures | 0 | 5,842,000 |  |
Accounts receivable, net of allowance of $4,138 and $5,873 | 2,446,000 | 20,500,000 |  |
Cash and cash equivalents | 7,707,000 | 53,085,000 |  |
Restricted cash | 0 | 17,168,000 |  |
Intangible assets, net | 0 | 24,541,000 |  |
Right-of-use asset, net | 26,000 | 4,109,000 |  |
Other assets, net | 3,237,000 | 103,965,000 |  |
Total assets of discontinued operations, net | 13,416,000 | 2,544,068,000 |  |
Assets held for sale, net | 23,774,000 | 82,238,000 |  |
Assets held for sale and discontinued operations, net | 37,190,000 | 2,626,306,000 |  |
LIABILITIES |  |  |  |
Mortgage debt | 0 | 318,876,000 |  |
Lease liability | 26,000 | 3,189,000 |  |
Accounts payable, accrued liabilities, and other liabilities | 14,843,000 | 79,411,000 |  |
Deferred revenue | 92,000 | 11,442,000 |  |
Total liabilities of discontinued operations, net | 14,961,000 | 412,918,000 |  |
Liabilities related to assets held for sale, net | 95,000 | 2,819,000 |  |
Liabilities related to assets held for sale and discontinued operations, net | 15,056,000 | 415,737,000 |  |
Goodwill | 0 | 29,000,000 |  |
Net real estate assets | 23,000,000 | 73,000,000 |  |
Right-of-use asset, net | $ 1,000,000 |  |  |
Deferred revenue |  | $ 2,000,000 |  |
Held-for-sale | Senior Housing Operating Portfolio |  |  |  |
LIABILITIES |  |  |  |
Number of properties classified as held for sale | property | 0 | 97 |  |
Held-for-sale | Senior Housing Triple Net |  |  |  |
LIABILITIES |  |  |  |
Number of properties classified as held for sale | property | 0 | 41 |  |
Held-for-sale | Senior Housing Operating Portfolio Joint Venture |  |  |  |
LIABILITIES |  |  |  |
Number of properties classified as held for sale | property |  | 1 |  |
Held-for-sale | Medical Office |  |  |  |
LIABILITIES |  |  |  |
Number of properties classified as held for sale | property | 4 | 6 |  |
Held-for-sale | Life science |  |  |  |
LIABILITIES |  |  |  |
Number of properties classified as held for sale | property | 1 |  |  |

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