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Other intangible assets (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net (excluding goodwill) $ 23,401 $ 31,515 $ 23,401 $ 31,515 $ 25,496
Amortization of intangible assets 1,200 2,700 2,700 4,700  
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 29,423 30,087 29,423 30,087 28,836
Intangible assets, less accumulated amortization 8,765 5,239 8,765 5,239 6,887
Intangible assets, net (excluding goodwill) 20,658 24,848 20,658 24,848 21,949
Noncompete agreements          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 3,991 4,229 3,991 4,229 3,941
Intangible assets, less accumulated amortization 2,576 2,084 2,576 2,084 2,309
Intangible assets, net (excluding goodwill) 1,415 2,145 1,415 2,145 1,632
Other intangible assets          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, gross 11,957 13,060 11,957 13,060 12,927
Intangible assets, less accumulated amortization 10,629 8,538 10,629 8,538 11,012
Intangible assets, net (excluding goodwill) $ 1,328 $ 4,522 $ 1,328 $ 4,522 $ 1,915