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Intangible assets (Notes) | 3 Months Ended
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Mar. 31, 2019
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)
| March 31, 2019 |  | December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Trade names | $ | 8,234 |  |  | $ | (1,592 | ) |  | $ | 6,642 |  |  | $ | 8,090 |  |  | $ | (1,447 | ) |  | $ | 6,643 |
Customer relationships | 7,211 |  |  | (837 | ) |  | 6,374 |  |  | 7,114 |  |  | (645 | ) |  | 6,469 |
| $ | 15,445 |  |  | $ | (2,429 | ) |  | $ | 13,016 |  |  | $ | 15,204 |  |  | $ | (2,092 | ) |  | $ | 13,112 |
Amortization expense of $0.3 million and $0.2 million related to intangible assets was recorded in General and administrative expenses for the three months ended March 31, 2019 and 2018, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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