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Real Estate Transactions - 2020 Real Estate Investments (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 03, 2020 USD ($) | Dec. 31, 2020 USD ($) property | Nov. 30, 2020 USD ($) property | Oct. 31, 2020 USD ($) a property | Jul. 31, 2020 USD ($) property | Apr. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) property | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) asset | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  |  |  |  |  |  |  | $ 0 | $ 89,868 | $ 393,997
Loss (gain) upon change of control, net |  |  | $ 16,000 |  |  |  |  |  | 159,973 | $ 168,023 | $ 9,154
Long-term debt, gross |  | $ 6,346,370 |  |  |  |  |  |  | $ 6,346,370 |  |
Land |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |  |  |  |
Life Science JVs |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  | 49.00% |  |  |  |  |  |  | 49.00% |  |
Waldwick |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 1 |  |  |  |  |  |  |
Investment ownership percentage |  |  |  | 100.00% |  |  |  |  |  |  |
Additional ownership percentage acquired |  |  |  | 15.00% |  |  |  |  |  |  |
Payments to acquire real estate joint ventures |  |  |  | $ 4,000 |  |  |  |  |  |  |
Gain on consolidation |  |  |  | $ 6,000 |  |  |  |  |  |  |
MBK JV |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  | $ 11,000 |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 36,000 |  |  |  |  |  |  |  |
Massachusetts |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 54,000 |  |  |  |  |  |  |  |  |
Massachusetts | Life Science JVs |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  | 49.00% |  |  |  |  |  |  | 49.00% |  |
San Francisco, California |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  | 12 |  |  |  |  |  |  |
Payments to acquire land |  |  |  | $ 128,000 |  |  |  |  |  |  |
Number of adjacent sites currently held | property |  |  |  | 2 |  |  |  |  |  |  |
Payments for deposits on real estate acquisitions | $ 10,000 |  |  |  |  |  |  |  |  |  |
Life Science |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | asset |  |  |  |  |  |  |  |  | 3 |  |
Life Science | Land |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  |  | $ 27,000 |  |  |
Life Science | Massachusetts |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 610,000 |  |  |  | $ 320,000 |  |  |  |  |
Number of properties acquired | property |  | 3 |  |  |  |  |  |  |  |  |
Medical Office |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  |  | 1 |  |  |  | 7 |  |
Medical Office | ARIZONA |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 27,000 |  |  |  |  |  |
Medical Office | Indiana, Missouri, Illinois |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 169,000 |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 7 |  |  |  |  |  |  |
Medical Office | Texas |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 34,000 |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 1 |  |  |  |  |  |  |  |  |
Senior Housing |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  | 1 |  |  |  |
Investment ownership percentage |  |  |  |  |  |  | 100.00% |  |  |  |
Gain on consolidation |  |  |  |  |  |  | $ 12,000 |  |  |  |
Land parcel |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |  |  |  |

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