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Intangible Assets on Real Estate Acquisitions | 12 Months Ended
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Dec. 31, 2014
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, 2014 |  | December 31, 2013
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
In-place lease value |  | $ | 123,759 |  |  | $ | 101,040 |  |  | $ | 22,719 |  |  | $ | 125,504 |  |  | $ | 93,885 |  |  | $ | 31,619 |
Tenant relationship value |  | 42,301 |  |  | 28,492 |  |  | 13,809 |  |  | 44,414 |  |  | 25,962 |  |  | 18,452 |
Below-market cost arrangements |  | 12,415 |  |  | 5,984 |  |  | 6,431 |  |  | 12,416 |  |  | 5,136 |  |  | 7,280 |
Above-market leases |  | 8,659 |  |  | 8,159 |  |  | 500 |  |  | 8,925 |  |  | 7,970 |  |  | 955 |
Market concentration premium |  | 1,333 |  |  | 938 |  |  | 395 |  |  | 1,333 |  |  | 381 |  |  | 952 |
|  | $ | 188,467 |  |  | $ | 144,613 |  |  | $ | 43,854 |  |  | $ | 192,592 |  |  | $ | 133,334 |  |  | $ | 59,258 |
Amortization of the intangible asset categories set forth above totaled $15.2 million in 2014, $16.2 million in 2013 and $21.4 million in 2012. The approximate weighted average amortization periods of the categories set forth above follow: in-place lease value: six years; tenant relationship value: seven years; below-market cost arrangements: 31 years; above-market leases: two years; and market concentration premium: 28 years. The approximate weighted average amortization period for all of the categories combined is ten years. The estimated amortization expense associated with the intangible asset categories set forth above for the next five years is: $9.3 million for 2015; $8.4 million for 2016; $6.2 million for 2017; $3.8 million for 2018; and $3.4 million for 2019.

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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 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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