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Real Estate Intangibles - Summary of Real Estate Intangibles Excluding Those Classified as Held For Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Assets: |  |
Gross historical cost | $ 1,844,780 | $ 1,789,628
Accumulated amortization | (1,338,046) | (1,286,259)
Net book value | $ 506,734 | $ 503,369
Weighted-average amortization period in years | 7 years 2 months 12 days | 5 years 6 months
Liabilities: |  |
Below market tenant leases | $ 74,910 | $ 74,909
Accumulated amortization | (47,174) | (45,291)
Net book value | $ 27,736 | $ 29,618
Weighted-average amortization period in years | 8 years 3 months 18 days | 8 years 2 months 12 days
In place lease intangibles |  |
Assets: |  |
Gross historical cost | $ 1,732,980 | $ 1,681,533
Above market tenant leases |  |
Assets: |  |
Gross historical cost | 53,988 | 53,964
Lease commissions |  |
Assets: |  |
Gross historical cost | $ 57,812 | $ 54,131

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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