Other intangible assets (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net (excluding goodwill)	$ 20,040	$ 23,401	$ 20,040	$ 23,401	$ 22,578
Amortization of intangible assets	1,300	1,200	2,500	2,700
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	28,990	29,423	28,990	29,423	29,740
Intangible assets, less accumulated amortization	11,812	8,765	11,812	8,765	10,650
Intangible assets, net (excluding goodwill)	17,178	20,658	17,178	20,658	19,090
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	4,591	3,991	4,591	3,991	4,591
Intangible assets, less accumulated amortization	3,206	2,576	3,206	2,576	2,856
Intangible assets, net (excluding goodwill)	1,385	1,415	1,385	1,415	1,735
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	5,607	11,957	5,607	11,957	12,601
Intangible assets, less accumulated amortization	4,130	10,629	4,130	10,629	10,848
Intangible assets, net (excluding goodwill)	$ 1,477	$ 1,328	$ 1,477	$ 1,328	$ 1,753