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Real Estate Transactions - 2020 Real Estate Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) property | Oct. 31, 2021 USD ($) property | Sep. 30, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Nov. 30, 2020 USD ($) property | Oct. 31, 2020 USD ($) property | Jul. 31, 2020 USD ($) property | Apr. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 89,868
Loss (gain) upon change of control, net |  |  |  |  |  |  |  |  | (1,042) | $ (159,973) | $ (168,023)
Long-term debt, gross | $ 6,216,234 |  |  |  |  |  |  |  | $ 6,216,234 |  |
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] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 1 |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture |  |  |  |  | $ 11,000 |  |  |  |  |  |
Loss (gain) upon change of control, net |  |  |  |  | 16,000 |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 36,000 |  |  |  |  |  |
MBK JV | Land |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  | 1 |  |  |  |  |  |
MASSACHUSETTS |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 54,000 |  |  |  |  |  |  |
MASSACHUSETTS | Life Science JV |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  | 49.00% |  |  |  |  |  | 49.00% |
Medical Office |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  | 2 | 7 |
Medical Office | MASSACHUSETTS |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 80,000 |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 1 |  |  |  |  |  |  |  |  |
Medical Office | ARIZONA |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  | $ 27,000 |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  | 1 |  |  |  |
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 |  |  | $ 60,000 | $ 34,000 |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 2 | 1 |  |  |  |  |  |  |
Life science |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  |  | 3 |
Life science | Life Science JV |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage | 49.00% |  |  |  |  |  |  |  | 49.00% |  |
Life science | MASSACHUSETTS |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 45,000 | $ 73,000 | $ 180,000 | $ 610,000 |  |  |  | $ 320,000 |  |  |
Number of properties acquired | property | 2 |  | 3 | 3 |  |  |  |  |  |  |

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