Other intangible assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net (excluding goodwill)	$ 22,578	$ 25,496
Amortization of intangible assets	5,100	9,000	$ 2,400
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	29,740	28,836
Intangible assets, less accumulated amortization	10,650	6,887
Intangible assets, net (excluding goodwill)	19,090	21,949
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	4,591	3,941
Intangible assets, less accumulated amortization	2,856	2,309
Intangible assets, net (excluding goodwill)	1,735	1,632
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	12,601	12,927
Intangible assets, less accumulated amortization	10,848	11,012
Intangible assets, net (excluding goodwill)	$ 1,753	$ 1,915