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Other Intangible, Net and Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands)
Customer relationships | 20 |  | $ | 13,600 |  |  | $ | 1,987 |  |  | $ | 11,613 |
Tradename | 0.5-6 |  | 8,100 |  |  | 6,404 |  |  | 1,696 |
Covenants not to compete | 1-10 |  | 4,200 |  |  | 1,809 |  |  | 2,391 |
|  |  | $ | 25,900 |  |  | $ | 10,200 |  |  | $ | 15,700 |
Goodwill [Line Items] |
Schedule of Goodwill [Table Text Block] |
| (in thousands)
Balance at December 31, 2017 | $ | 132,410 |
Acquisition | — |
Balance at June 30, 2018 | $ | 132,410 |

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