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Debt - Mortgage Debt (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) derivative_held facility | Dec. 31, 2021 USD ($) derivative_held facility | Dec. 31, 2020 USD ($) | Aug. 31, 2022 derivative_held | Apr. 30, 2022 derivative_held | Apr. 30, 2021 USD ($) | Jun. 23, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, gross | $ 6,540,817 |  |  |  |  |  |
Cash Flow Hedging |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of interest-rate contracts held | derivative_held | 2 |  |  |  |  |  |
Interest rate swap instruments |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of interest-rate contracts held | derivative_held |  | 0 |  |  |  |  |
Interest rate swap instruments | Designated as Hedging Instrument |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of interest-rate contracts held | derivative_held |  |  |  | 2 |  |  |
Interest rate swap instruments | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of interest-rate contracts held | derivative_held |  |  |  |  | 2 |  |
Medical Office | Mortgage Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 142,000 |
Mortgage Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, gross | $ 345,211 | $ 350,000 |  |  |  |  |
Number of healthcare facilities used to secure debt (in facilities) | facility | 18 | 18 |  |  |  |  |
Debt instrument, collateral, healthcare facilities carrying value | $ 793,000 | $ 811,000 |  |  |  |  |
Debt instrument, periodic payment, principal | 5,000 | 9,000 | $ 5,000 |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, gross | $ 4,700,000 | $ 4,700,000 |  |  |  |  |
Senior Unsecured Notes | Senior Unsecured Notes 2.88% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 600,000
Interest rate (as a percent) |  |  |  |  |  |  | 2.88%

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