Goodwill and intangible assets - Company's other intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Goodwill and intangible assets
Gross Carrying Amount	$ 32,997	$ 32,997
Accumulated Amortization	16,131	15,433
Net	16,866	17,564
Covenant not to compete
Goodwill and intangible assets
Gross Carrying Amount	870	870
Accumulated Amortization	732	710
Net	$ 138	160
Covenant not to compete | Maximum
Goodwill and intangible assets
Amortization Period (in years)	10 years
Covenant not to compete | Minimum
Goodwill and intangible assets
Amortization Period (in years)	6 years
Customer relationships
Goodwill and intangible assets
Gross Carrying Amount	$ 31,560	31,560
Accumulated Amortization	15,156	14,491
Net	$ 16,404	17,069
Customer relationships | Maximum
Goodwill and intangible assets
Amortization Period (in years)	12 years
Customer relationships | Minimum
Goodwill and intangible assets
Amortization Period (in years)	3 years
Above market leases
Goodwill and intangible assets
Amortization Period (in years)	13 years
Gross Carrying Amount	$ 567	567
Accumulated Amortization	243	232
Net	$ 324	$ 335