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Intangible Assets on Real Estate Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 222,683 | $ 223,054 |
Accumulated Amortization | 163,591 | 144,703 |
Net Carrying Amount | 59,092 | 78,351 |
Amortization of the intangible assets | $ 19,300 | 20,000 | $ 18,500
Weighted average amortization period of intangible assets | 11 years |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
2018 | $ 14,500 |  |
2019 | 8,100 |  |
2020 | 5,700 |  |
2021 | 5,500 |  |
2022 | 4,100 |  |
In-place lease value [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 132,276 | 132,647 |
Accumulated Amortization | 110,814 | 99,940 |
Net Carrying Amount | $ 21,462 | 32,707 |
Weighted average amortization period of intangible assets | 6 years |  |
Tenant relationship value [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 60,028 | 60,028 |
Accumulated Amortization | 32,198 | 26,253 |
Net Carrying Amount | $ 27,830 | 33,775 |
Weighted average amortization period of intangible assets | 8 years |  |
Below-market cost arrangements [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 15,102 | 15,102 |
Accumulated Amortization | 7,507 | 7,285 |
Net Carrying Amount | $ 7,595 | 7,817 |
Weighted average amortization period of intangible assets | 34 years |  |
Above-market leases [Member] |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 13,944 | 13,944 |
Accumulated Amortization | 12,092 | 10,259 |
Net Carrying Amount | $ 1,852 | 3,685 |
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 | 980 | 966 |
Net Carrying Amount | $ 353 | $ 367 |
Weighted average amortization period of intangible assets | 25 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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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