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Real Estate Properties - Schedule of Acquisitions (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) property unit | Jun. 30, 2018 USD ($) property unit | Mar. 31, 2018 USD ($) ft² property | Feb. 28, 2018 USD ($) unit property | Jan. 31, 2018 USD ($) ft² property unit | Dec. 31, 2020 USD ($) ft² property | Dec. 31, 2019 USD ($) property unit | Dec. 31, 2018 USD ($) property
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 397 |  |
Net Book Value of Collateral | $ 5,890,785 |  |  |  |  | $ 5,715,829 | $ 5,890,785 |
Assumed Debt |  |  |  |  |  | $ 0 | $ 0 | $ (44,386)
Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  | 8
Cash Paid plus Assumed Debt |  |  |  |  |  |  |  | $ 181,323
Acquired Real Estate Leases / Resident Agreements |  |  |  |  |  |  |  | 41,016
Acquired Real Estate Lease Obligations |  |  |  |  |  |  |  | 0
Assumed Debt |  |  |  |  |  |  |  | (44,386)
Premium on Assumed Debt |  |  |  |  |  |  |  | (1,845)
Medical Office / Life Science |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 123 |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 11,300,000 |  |
Medical Office / Life Science | 3 States | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  | 3 |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  | 400,000 |  |  |
Cash Paid plus Assumed Debt |  |  |  |  | $ 91,698 |  |  |
Acquired Real Estate Leases / Resident Agreements |  |  |  |  | 20,220 |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  | 0 |  |  |
Assumed Debt |  |  |  |  | 0 |  |  |
Premium on Assumed Debt |  |  |  |  | $ 0 |  |  |
AL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  | 1 |  |  |
Number of Units | unit |  |  |  |  | 88 |  |  |
Cash Paid plus Assumed Debt |  |  |  |  | $ 19,868 |  |  |
Acquired Real Estate Leases / Resident Agreements |  |  |  |  | 3,195 |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  | 0 |  |  |
Assumed Debt |  |  |  |  | 0 |  |  |
Premium on Assumed Debt |  |  |  |  | 0 |  |  |
IL | Texas | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property | 1 |  |  |  |  |  | 1 |
Number of Units | unit | 169 |  |  |  |  |  | 169 |
Cash Paid plus Assumed Debt | $ 50,506 |  |  |  |  |  |  |
Acquired Real Estate Leases / Resident Agreements | 2,202 |  |  |  |  |  | $ 2,202 |
Acquired Real Estate Lease Obligations | 0 |  |  |  |  |  | $ 0 |
Assumed Debt | 0 |  |  |  |  |  |  |
Premium on Assumed Debt | $ 0 |  |  |  |  |  |  |
IL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  | 2 |  |  |  |  |  |
Number of Units | unit |  | 151 |  |  |  |  |  |
Cash Paid plus Assumed Debt |  | $ 23,860 |  |  |  |  |  |
Acquired Real Estate Leases / Resident Agreements |  | 3,843 |  |  |  |  |  |
Acquired Real Estate Lease Obligations |  | 0 |  |  |  |  |  |
Assumed Debt |  | (16,588) |  |  |  |  |  |
Premium on Assumed Debt |  | (486) |  |  |  |  |  |
IL | Arizona | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  | 1 |  |  |  |
Number of Units | unit |  |  |  | 127 |  |  |  |
Cash Paid plus Assumed Debt |  |  |  | $ 22,622 |  |  |  |
Acquired Real Estate Leases / Resident Agreements |  |  |  | 4,451 |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  | 0 |  |  |  |
Assumed Debt |  |  |  | (16,748) |  |  |  |
Premium on Assumed Debt |  |  |  | (1,359) |  |  |  |
Medical Office |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property | 20 |  |  |  |  | 7 | 20 |
Medical Office | Virginia | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Number of Properties | property |  |  | 1 |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  | 135,000 |  |  |  |  |
Cash Paid plus Assumed Debt |  |  | $ 23,275 |  |  |  |  |
Acquired Real Estate Leases / Resident Agreements |  |  | 9,307 |  |  |  |  |
Acquired Real Estate Lease Obligations |  |  | 0 |  |  |  |  |
Assumed Debt |  |  | (11,050) |  |  |  |  |
Premium on Assumed Debt |  |  | 0 |  |  |  |  |
Land |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral | $ 793,123 |  |  |  |  | $ 789,125 | $ 793,123 |
Land | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  | 23,298
Land | Medical Office / Life Science | 3 States | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  | 16,873 |  |  |
Land | AL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  | 580 |  |  |
Land | IL | Texas | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral | 3,463 |  |  |  |  |  | 3,463 |
Land | IL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  | 965 |  |  |  |  |  |
Land | IL | Arizona | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  | 2,017 |  |  |  |
Land | Medical Office | Virginia | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 2,863 |  |  |  |  |
Buildings and Improvements |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral | 6,668,463 |  |  |  |  | $ 6,621,605 | 6,668,463 |
Buildings and Improvements | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  | 115,627
Buildings and Improvements | Medical Office / Life Science | 3 States | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  | 54,605 |  |  |
Buildings and Improvements | AL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  | 14,884 |  |  |
Buildings and Improvements | IL | Texas | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral | 44,189 |  |  |  |  |  | 44,189 |
Buildings and Improvements | IL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  | 17,910 |  |  |  |  |  |
Buildings and Improvements | IL | Arizona | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  | 17,123 |  |  |  |
Buildings and Improvements | Medical Office | Virginia | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | 11,105 |  |  |  |  |
FF&E | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  |  |  |  | $ 3,227
FF&E | Medical Office / Life Science | 3 States | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  | 0 |  |  |
FF&E | AL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  |  | $ 1,209 |  |  |
FF&E | IL | Texas | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral | $ 652 |  |  |  |  |  | $ 652 |
FF&E | IL | Tennessee | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  | $ 1,628 |  |  |  |  |  |
FF&E | IL | Arizona | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  |  | $ 390 |  |  |  |
FF&E | Medical Office | Virginia | Acquisitions |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |
Net Book Value of Collateral |  |  | $ 0 |  |  |  |  |

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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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