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Credit Concentration - Summary of Credit Concentration (Details) £ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 GBP (£) property | Dec. 31, 2021
Concentration Risk [Line Items] |  |  |  |  |  |  |
Total NOI | $ 618,453 |  | $ 498,335 | $ 1,160,488 | $ 933,071 |  |
Percentage total investments with top five customers |  |  |  |  |  |  | 34.00%
Payment to acquire interest in joint venture |  |  |  | 307,513 | $ 233,296 |  |
Gain on termination of lease |  |  |  | 58,621 |  |  |
Promedica Joint Ventures |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Ownership interest |  | 5.00% |  |  |  |  |
Payment to acquire interest in joint venture |  | $ 137,437 |  |  |  |  |
HC-One Group |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Financing receivable | £ |  |  |  |  |  | £ 529,848 |
Net operating income | Credit Concentration Risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 1,711 |
Total NOI |  |  |  | $ 1,160,488 |  |  |
Percent of NOI |  |  |  | 100.00% |  |  |
Net operating income | Credit Concentration Risk | ProMedica |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 205 |
Total NOI |  |  |  | $ 122,204 |  |  |
Percent of NOI |  |  |  | 11.00% |  |  |
Net operating income | Credit Concentration Risk | Atria Senior Living |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 98 |
Total NOI |  |  |  | $ 105,343 |  |  |
Percent of NOI |  |  |  | 10.00% |  |  |
Net operating income | Credit Concentration Risk | Sunrise Senior Living |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 109 |
Total NOI |  |  |  | $ 79,826 |  |  |
Percent of NOI |  |  |  | 7.00% |  |  |
Net operating income | Credit Concentration Risk | HC-One Group |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 1 |
Total NOI |  |  |  | $ 45,739 |  |  |
Percent of NOI |  |  |  | 4.00% |  |  |
Net operating income | Credit Concentration Risk | Avery Healthcare |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 61 |
Total NOI |  |  |  | $ 38,118 |  |  |
Percent of NOI |  |  |  | 4.00% |  |  |
Net operating income | Credit Concentration Risk | Remaining portfolio |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 1,237 |
Total NOI |  |  |  | $ 769,258 |  |  |
Percent of NOI |  |  |  | 64.00% |  |  |

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