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Real Estate Intangibles - Summary of Real Estate Intangibles Excluding Those Classified as Held For Sale (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Assets: |  |
Gross historical cost | $ 1,902,141 | $ 1,789,628
Accumulated amortization | (1,375,588) | (1,286,259)
Net book value | $ 526,553 | $ 503,369
Weighted-average amortization period in years | 6 years 10 months 24 days | 5 years 6 months
Liabilities: |  |
Below market tenant leases | $ 75,960 | $ 74,909
Accumulated amortization | (48,683) | (45,291)
Net book value | $ 27,277 | $ 29,618
Weighted-average amortization period in years | 8 years 4 months 24 days | 8 years 2 months 12 days
In place lease intangibles |  |
Assets: |  |
Gross historical cost | $ 1,786,965 | $ 1,681,533
Above market tenant leases |  |
Assets: |  |
Gross historical cost | 55,198 | 53,964
Lease commissions |  |
Assets: |  |
Gross historical cost | $ 59,978 | $ 54,131

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