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Real Estate Transactions - 2019 Real Estate Investments (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) property asset | Jul. 31, 2019 USD ($) property facility | Jun. 30, 2019 USD ($) property | May 31, 2019 USD ($) property | Apr. 30, 2019 USD ($) property | Nov. 30, 2018 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) property asset | Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000,000 |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  | $ 11,000,000 | $ 0 | $ 11,000,000 | $ 8,000,000 | $ 95,000,000 | $ 25,000,000 |  | $ 22,900,000 | 925,985,000 | $ 356,641,000
Long-term debt, gross |  |  | $ 6,307,244,000 |  |  |  |  |  |  | $ 6,307,244,000 |  |  |  |  |  |  | 6,307,244,000 |  |
Gain on consolidation |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  | 168,023,000 | $ 9,154,000 | 0
Life science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  |
Senior housing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire outstanding equity interests |  |  |  |  | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  | 100.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Gain on consolidation |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on consolidation, tax |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Life Science JVs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 245,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Medical office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,000,000
Life Science facility | Life science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  | 71,000,000 |  |  |  |  |  |
Land | Life science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,000,000 |  |  |  |  |  |
Senior housing | Senior housing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 284,000,000 |  | $ 113,000,000 | $ 445,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 5 |  | 3 | 9 |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 112,000,000 |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Boston | Life Science facility | Life science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 228,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | facility |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cambridge, Massachusetts | Life Science facility | Life science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 333,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kansas | Medical office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |
Number of properties acquired | asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Texas | Medical office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,000,000 |  |
Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |
Assets leased to others | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |
SHOP JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 54.00% |  |  |  |  |  |  | 54.00% |  |  |  |  |  |  | 54.00% |  |
Purchase cost |  |  | $ 367,000,000 |  |  |  |  |  |  | $ 367,000,000 |  |  |  |  |  |  | $ 367,000,000 |  |
Partner's ownership percentage |  |  | 46.50% |  |  |  |  |  |  | 46.50% |  |  |  |  |  |  | 46.50% |  |
SHOP JV | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 53.50% |  |  |  |  |  |  | 53.50% |  |  |  |  |  |  | 53.50% |  |
Purchase cost |  |  | $ 790,000,000 |  |  |  |  |  |  | $ 790,000,000 |  |  |  |  |  |  | $ 790,000,000 |  |
SHOP JV | Assets leased to others | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned | property |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHOP JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on deconsolidation |  |  | $ 161,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Massachusetts | Life science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 320,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrefundable deposit | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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