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Intangible assets (Notes) | 12 Months Ended
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Dec. 31, 2017
Intangible Assets [Abstract] |
Intangible Assets Disclosure [Text Block] | Intangible assets The gross carrying amount and accumulated amortization by intangible asset class were as follows:
| (Dollars in thousands)
| December 31, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Trade names | $ | 8,182 |  |  | $ | (957 | ) |  | $ | 7,225 |  |  | $ | 1,000 |  |  | $ | (787 | ) |  | $ | 213 |
Customer relationships | 4,911 |  |  | (323 | ) |  | 4,588 |  |  | 716 |  |  | (85 | ) |  | 631 |
| $ | 13,093 |  |  | $ | (1,280 | ) |  | $ | 11,813 |  |  | $ | 1,716 |  |  | $ | (872 | ) |  | $ | 844 |
Amortization expense of $0.4 million, $0.1 million and $0.1 million related to intangible assets was recorded in General and administrative expenses for 2017, 2016 and 2015, respectively. The estimated aggregate amortization expense for each of the next five years are as follows:
|  | (Dollars in thousands)
Year |  | Amortization
2018 |  | $ | 875 |
2019 |  | 1,111 |
2020 |  | 1,254 |
2021 |  | 1,363 |
2022 |  | 1,154 |
Thereafter |  | 6,056 |
|  | $ | 11,813 |
The gross carrying amount and accumulated amortization by intangible asset class were as follows:
| (Dollars in thousands)
| December 31, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Trade names | $ | 8,182 |  |  | $ | (957 | ) |  | $ | 7,225 |  |  | $ | 1,000 |  |  | $ | (787 | ) |  | $ | 213 |
Customer relationships | 4,911 |  |  | (323 | ) |  | 4,588 |  |  | 716 |  |  | (85 | ) |  | 631 |
| $ | 13,093 |  |  | $ | (1,280 | ) |  | $ | 11,813 |  |  | $ | 1,716 |  |  | $ | (872 | ) |  | $ | 844 |

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- Definition Intangible Assets [Abstract] + 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 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: 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=66006027&loc=d3e16323-109275 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=66006027&loc=d3e16373-109275 + Details
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