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Intangible assets Schedule of intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |
Intangible Assets Disclosure [Text Block] | Intangible assets The gross carrying amount and accumulated amortization by intangible asset class were as follows:
| (Dollars in thousands) |  | (Dollars in thousands)
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Trade names | $ | 8,090 |  |  | $ | (1,447 | ) |  | $ | 6,643 |  |  | $ | 8,182 |  |  | $ | (957 | ) |  | $ | 7,225 |
Customer relationships | 7,114 |  |  | (645 | ) |  | 6,469 |  |  | 4,911 |  |  | (323 | ) |  | 4,588 |
| $ | 15,204 |  |  | $ | (2,092 | ) |  | $ | 13,112 |  |  | $ | 13,093 |  |  | $ | (1,280 | ) |  | $ | 11,813 |
The Company reviews goodwill and intangibles for potential impairment annually on December 1st or when an event or other circumstances change that would more likely than not reduce the fair value of the asset below its carrying value. Amortization expense of $0.9 million and $0.4 million related to intangible assets was recorded in General and administrative expenses for 2018 and 2017, respectively. The estimated aggregate amortization expense for each of the next five years are as follows:
|  | (Dollars in thousands)
Year |  | Amortization
2019 |  | $ | 1,352 |
2020 |  | 1,492 |
2021 |  | 1,600 |
2022 |  | 1,406 |
2023 |  | 1,292 |
Thereafter |  | 5,970 |
|  | $ | 13,112 |
The gross carrying amount and accumulated amortization by intangible asset class were as follows:
| (Dollars in thousands) |  | (Dollars in thousands)
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Trade names | $ | 8,090 |  |  | $ | (1,447 | ) |  | $ | 6,643 |  |  | $ | 8,182 |  |  | $ | (957 | ) |  | $ | 7,225 |
Customer relationships | 7,114 |  |  | (645 | ) |  | 6,469 |  |  | 4,911 |  |  | (323 | ) |  | 4,588 |
| $ | 15,204 |  |  | $ | (2,092 | ) |  | $ | 13,112 |  |  | $ | 13,093 |  |  | $ | (1,280 | ) |  | $ | 11,813 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration