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Intangible Assets on Real Estate Acquisitions | 12 Months Ended
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Dec. 31, 2017
Intangible Assets on Real Estate Acquisitions |
Intangible Assets on Real Estate Acquisitions | Intangible Assets on Real Estate Acquisitions Intangible assets on real estate acquisitions consisted of the following (in thousands):
|  | December 31, 2017 |  | December 31, 2016
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
In-place lease value |  | $ | 132,276 |  |  | $ | 110,814 |  |  | $ | 21,462 |  |  | $ | 132,647 |  |  | $ | 99,940 |  |  | $ | 32,707 |
Tenant relationship value |  | 60,028 |  |  | 32,198 |  |  | 27,830 |  |  | 60,028 |  |  | 26,253 |  |  | 33,775 |
Below-market cost arrangements |  | 15,102 |  |  | 7,507 |  |  | 7,595 |  |  | 15,102 |  |  | 7,285 |  |  | 7,817 |
Above-market leases |  | 13,944 |  |  | 12,092 |  |  | 1,852 |  |  | 13,944 |  |  | 10,259 |  |  | 3,685 |
Other |  | 1,333 |  |  | 980 |  |  | 353 |  |  | 1,333 |  |  | 966 |  |  | 367 |
|  | $ | 222,683 |  |  | $ | 163,591 |  |  | $ | 59,092 |  |  | $ | 223,054 |  |  | $ | 144,703 |  |  | $ | 78,351 |
Amortization of the intangible asset categories set forth above totaled $19.3 million in 2017, $20.0 million in 2016 and $18.5 million in 2015. The approximate weighted average amortization periods of the categories set forth above follow: in-place lease value: six years; tenant relationship value: eight years; below-market cost arrangements: 34 years; above-market leases: three years; and other: 25 years. The approximate weighted average amortization period for all of the categories combined is 11 years. The estimated amortization (to amortization associated with real estate operations, rental revenue and property operating expenses) associated with the intangible asset categories set forth above for the next five years is: $14.5 million for 2018; $8.1 million for 2019; $5.7 million for 2020; $5.5 million for 2021; and $4.1 million for 2022.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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