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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | $ 759,720 | $ 788,895 | $ 677,274
Life Science |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | 472,301 | 573,999 | 499,956
Medical Office |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | 230,227 | 173,672 | 146,466
CCRC |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | 57,192 | 41,224 | 0
Other |  |  |
Real estate acquisitions [Line Items] |  |  |
Funding for construction, tenant and other capital improvements | $ 0 | $ 0 | $ 30,852

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9212-128498 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9215-128498 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123385561&loc=d3e9135-128495 + Details
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