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Intangible Assets on Property Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 197,468 | $ 198,724 |
Accumulated Amortization | 187,509 | 184,157 |
Net Carrying Amount | 9,959 | 14,567 |
Amortization of the intangible assets | $ 4,600 | 4,700 | $ 8,000
Weighted average amortization period of intangible assets | 6 years |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
2023 | $ 2,900 |  |
2024 | 1,900 |  |
2025 | 1,600 |  |
2026 | 1,000 |  |
2027 | 717 |  |
In-place lease value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 125,207 | 125,591 |
Accumulated Amortization | 120,178 | 118,983 |
Net Carrying Amount | $ 5,029 | 6,608 |
Weighted average amortization period of intangible assets | 4 years |  |
Tenant relationship value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 57,210 | 58,082 |
Accumulated Amortization | 52,803 | 50,701 |
Net Carrying Amount | $ 4,407 | 7,381 |
Weighted average amortization period of intangible assets | 8 years |  |
Above-market leases |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 13,718 | 13,718 |
Accumulated Amortization | 13,476 | 13,435 |
Net Carrying Amount | $ 242 | 283 |
Weighted average amortization period of intangible assets | 5 years |  |
Other |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 1,333 | 1,333 |
Accumulated Amortization | 1,052 | 1,038 |
Net Carrying Amount | $ 281 | $ 295 |
Weighted average amortization period of intangible assets | 20 years |  |

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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 https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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