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Intangible Assets on Real Estate Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 223,054 | $ 227,481 |
Accumulated Amortization | 144,703 | 129,143 |
Net Carrying Amount | 78,351 | 98,338 |
Amortization of the intangible assets | $ 20,000 | 18,500 | $ 15,200
Weighted average amortization period of intangible assets | 11 years |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
2017 | $ 16,800 |  |
2018 | 11,600 |  |
2019 | 8,600 |  |
2020 | 6,800 |  |
2021 | 6,600 |  |
In-place lease value [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 132,647 | 134,664 |
Accumulated Amortization | 99,940 | 89,540 |
Net Carrying Amount | $ 32,707 | 45,124 |
Weighted average amortization period of intangible assets | 6 years |  |
Tenant relationship value [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 60,028 | 62,172 |
Accumulated Amortization | 26,253 | 23,468 |
Net Carrying Amount | $ 33,775 | 38,704 |
Weighted average amortization period of intangible assets | 10 years |  |
Below-market cost arrangements [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 15,102 | 15,102 |
Accumulated Amortization | 7,285 | 6,692 |
Net Carrying Amount | $ 7,817 | 8,410 |
Weighted average amortization period of intangible assets | 35 years |  |
Above-market leases [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 13,944 | 14,210 |
Accumulated Amortization | 10,259 | 8,491 |
Net Carrying Amount | $ 3,685 | 5,719 |
Weighted average amortization period of intangible assets | 3 years |  |
Other [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 1,333 | 1,333 |
Accumulated Amortization | 966 | 952 |
Net Carrying Amount | $ 367 | $ 381 |
Weighted average amortization period of intangible assets | 26 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://www.xbrl.org/2003/role/presentationRef -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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