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Real Estate Transactions - Construction, Tenant, and Other Capital Improvements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | $ 788,895 | $ 677,274 | $ 560,875
Life Science |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | 573,999 | 499,956 | 396,431
Medical Office |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | 173,672 | 146,466 | 146,087
CCRC |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | 41,224 | 0 | 0
Other |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | $ 0 | $ 30,852 | $ 18,357

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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