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Intangible Assets on Real Estate Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 216,358 | $ 222,683 |
Accumulated Amortization | 172,888 | 163,591 |
Net Carrying Amount | 43,470 | 59,092 |
Amortization of the intangible assets | $ 15,600 | 19,300 | $ 20,000
Weighted average amortization period of intangible assets | 12 years |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
2019 | $ 8,300 |  |
2020 | 5,500 |  |
2021 | 5,300 |  |
2022 | 3,800 |  |
2023 | 3,400 |  |
In-place lease value [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 132,276 | 132,276 |
Accumulated Amortization | 117,520 | 110,814 |
Net Carrying Amount | $ 14,756 | 21,462 |
Weighted average amortization period of intangible assets | 7 years |  |
Tenant relationship value [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 60,028 | 60,028 |
Accumulated Amortization | 39,703 | 32,198 |
Net Carrying Amount | $ 20,325 | 27,830 |
Weighted average amortization period of intangible assets | 9 years |  |
Below-market cost arrangements [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 8,880 | 15,102 |
Accumulated Amortization | 1,507 | 7,507 |
Net Carrying Amount | $ 7,373 | 7,595 |
Weighted average amortization period of intangible assets | 33 years |  |
Above-market leases [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 13,841 | 13,944 |
Accumulated Amortization | 13,164 | 12,092 |
Net Carrying Amount | $ 677 | 1,852 |
Weighted average amortization period of intangible assets | 6 years |  |
Other [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 1,333 | 1,333 |
Accumulated Amortization | 994 | 980 |
Net Carrying Amount | $ 339 | $ 353 |
Weighted average amortization period of intangible assets | 24 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 http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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