Goodwill and intangible assets - Company's other intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 32,997	$ 32,997
Accumulated amortization	13,338	12,640
Net	19,659	20,357
Covenant not to compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	870	870
Accumulated amortization	645	623
Net	$ 225	247
Covenant not to compete [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	10 years
Covenant not to compete [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	6 years
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,560	31,560
Accumulated amortization	12,494	11,829
Net	$ 19,066	19,731
Customer relationships [Member] | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	12 years
Customer relationships [Member] | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	3 years
Above market leases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	13 years
Gross Carrying Amount	$ 567	567
Accumulated amortization	199	188
Net	$ 368	$ 379