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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
| 2019 |  |  |  |  |  |
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands) |  |  |  |  |
Customer relationships | 15-20 |  | $ | 23,000 |  |  | $ | 3,221 |  |  | $ | 19,779 |
Tradename | 0.5-10 |  | 12,900 |  |  | 8,260 |  |  | 4,640 |
Covenants not to compete | 1-10 |  | 5,300 |  |  | 2,583 |  |  | 2,717 |
|  |  | $ | 41,200 |  |  | $ | 14,064 |  |  | $ | 27,136 |
| 2018 |  |  |  |  |  |
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands) |  |  |  |  |
Customer relationships | 20 |  | $ | 13,600 |  |  | $ | 2,329 |  |  | $ | 11,271 |
Tradename | 0.5-6 |  | 8,100 |  |  | 7,021 |  |  | 1,079 |
Covenants not to compete | 1-10 |  | 4,200 |  |  | 2,056 |  |  | 2,144 |
|  |  | $ | 25,900 |  |  | $ | 11,406 |  |  | $ | 14,494 |
Schedule of Goodwill [Table Text Block] | Changes in carrying amount of goodwill during the twelve months ended December 31, 2019 and December 31, 2018 were as follows:
| (in thousands)
Balance at December 31, 2017 | $ | 132,410 |
Acquisition | — |
Balance at December 31, 2018 | $ | 132,410 |
Acquisition | 35,885 |
Balance at December 31, 2019 | $ | 168,295 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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