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Other intangible assets (Details 2) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, net (excluding goodwill) | $ 31,515,000 | $ 11,323,000 | $ 31,515,000 | $ 11,323,000 | $ 15,246,000
Amortization of intangible assets | 2,700,000 | 500,000 | 4,700,000 | 1,100,000 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 30,087,000 | 14,601,000 | 30,087,000 | 14,601,000 | 17,958,000
Intangible assets, less accumulated amortization | 5,239,000 | 5,629,000 | 5,239,000 | 5,629,000 | 6,268,000
Intangible assets, net (excluding goodwill) | 24,848,000 | 8,972,000 | 24,848,000 | 8,972,000 | 11,690,000
Noncompete agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 4,229,000 | 3,179,000 | 4,229,000 | 3,179,000 | 3,439,000
Intangible assets, less accumulated amortization | 2,084,000 | 1,798,000 | 2,084,000 | 1,798,000 | 1,957,000
Intangible assets, net (excluding goodwill) | 2,145,000 | 1,381,000 | 2,145,000 | 1,381,000 | 1,482,000
Other intangible assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 13,060,000 | 6,578,000 | 13,060,000 | 6,578,000 | 8,094,000
Intangible assets, less accumulated amortization | 8,538,000 | 5,608,000 | 8,538,000 | 5,608,000 | 6,020,000
Intangible assets, net (excluding goodwill) | $ 4,522,000 | $ 970,000 | 4,522,000 | $ 970,000 | $ 2,074,000
Series of individually immaterial business combinations |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Other intangible assets acquired |  |  | $ 21,000,000.0 |  |

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