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Goodwill and other intangible assets (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-lived intangible assets [Line Items] |  |  |
Intangible assets, net (excluding goodwill) | $ 10,815 | $ 3,837 |
Amortization of intangible assets | 1,200 | 2,000 | $ 2,500
Estimated amortization expense for amortizable intangible assets |  |  |
2019 | 1,856 |  |
2020 | 1,486 |  |
2021 | 1,096 |  |
2022 | 1,072 |  |
2023 | 1,006 |  |
Thereafter | 4,299 |  |
Customer relationships [Member] |  |  |
Finite-lived intangible assets [Line Items] |  |  |
Intangible assets, gross | 22,720 | 15,248 |
Intangible assets, less accumulated amortization | 13,535 | 13,382 |
Intangible assets, net (excluding goodwill) | 9,185 | 1,866 |
Noncompete agreements [Member] |  |  |
Finite-lived intangible assets [Line Items] |  |  |
Intangible assets, gross | 2,605 | 2,430 |
Intangible assets, less accumulated amortization | 1,956 | 1,805 |
Intangible assets, net (excluding goodwill) | 649 | 625 |
Other [Member} |  |  |
Finite-lived intangible assets [Line Items] |  |  |
Intangible assets, gross | 6,458 | 6,990 |
Intangible assets, less accumulated amortization | 5,477 | 5,644 |
Intangible assets, net (excluding goodwill) | 981 | $ 1,346 |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |
Finite-lived intangible assets [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 8,200 |  |

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