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Other intangible assets (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, net (excluding goodwill) $ 23,961 $ 34,250 $ 25,496
Amortization of intangible assets 1,500 2,000  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, gross 28,836 30,087 28,836
Intangible assets, less accumulated amortization 7,792 4,138 6,887
Intangible assets, net (excluding goodwill) 21,044 25,949 21,949
Noncompete agreements      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, gross 3,941 4,229 3,941
Intangible assets, less accumulated amortization 2,441 1,928 2,309
Intangible assets, net (excluding goodwill) 1,500 2,301 1,632
Other intangible assets      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, gross 11,957 13,060 12,927
Intangible assets, less accumulated amortization 10,540 7,060 11,012
Intangible assets, net (excluding goodwill) $ 1,417 $ 6,000 $ 1,915