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Real Estate Transactions - 2019 Real Estate Investments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2020 USD ($) property | Jul. 31, 2020 property | Dec. 31, 2019 USD ($) property asset | Jul. 31, 2019 USD ($) facility property | Jun. 30, 2019 USD ($) property | May 31, 2019 USD ($) property | Apr. 30, 2019 USD ($) property | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) asset | Dec. 31, 2019 USD ($) property asset
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  |  | $ 6,346,370 |
Sierra Point Towers |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 245,000 |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 2 |  |  |  |  |
Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  |  |  |  |  |  |  | 3 |
Senior Housing |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 1 |  |  |  |  |
Payments to acquire outstanding equity interests |  |  |  |  | $ 24,000 |  |  |  |  |
Investment ownership percentage |  |  |  |  | 100.00% |  |  |  |  |
Gain on consolidation |  |  |  |  | $ 12,000 |  |  |  |  |
Gain on consolidation, tax |  |  |  |  | $ 1,000 |  |  |  |  |
Medical Office |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  | 1 |  |  |  |  |  |  | 7 |
Life Science facility | Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  | $ 71,000 |  |
Land |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property | 1 |  |  |  |  |  |  |  |  |
Land | Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  | $ 27,000 |  |
Senior Housing |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property | 1 |  |  |  |  |  |  |  |  |
Senior Housing | Senior Housing |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 284,000 |  | $ 113,000 | $ 445,000 |  |  |
Number of properties acquired | property |  |  |  | 5 |  | 3 | 9 |  |  |
Mortgage Debt |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 36,000 |  | $ 12,000 | $ 112,000 |  | $ 50,000 |  |  | $ 216,780 | $ 12,000
Boston | Life Science facility | Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 228,000 |  |  |  |  |  |
Number of properties acquired | facility |  |  |  | 4 |  |  |  |  |  |
Cambridge, Massachusetts | Life Science facility | Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 333,000 |  |  |  |  |  |  |
Number of properties acquired | asset |  |  | 1 |  |  |  |  |  |  |
Kansas | Medical Office |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  | $ 15,000
Number of properties acquired | asset |  |  |  |  |  |  |  |  |  | 1
Texas | Medical Office |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  | $ 9,000
Number of properties acquired | property |  |  |  |  |  |  |  |  |  | 1
San Diego | Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  | 1
San Diego | Life Science facility | Life Science |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  | $ 16,000
Assets leased to others |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned | property |  |  |  |  |  |  |  |  |  | 37
Assets leased to others | Senior Housing Operating Portfolio |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned | property |  |  |  |  |  |  |  |  |  | 20
SHOP JV |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  | 54.00% |
Purchase cost |  |  | $ 367,000 |  |  |  |  |  |  | $ 367,000
Partner's ownership percentage |  |  | 46.50% |  |  |  |  |  |  | 46.50%
SHOP JV | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 53.50% |  |  |  |  |  |  | 53.50%
Purchase cost |  |  | $ 790,000 |  |  |  |  |  |  | $ 790,000
SHOP JV | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned | property |  |  | 19 |  |  |  |  |  |  |
SHOP JV |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on deconsolidation |  |  | $ 161,000 |  |  |  |  |  |  |

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