UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 262,595	$ 234,027
Operating expenses:
Cost of operations	180,243	162,455
General and administration	35,679	29,793
Depreciation and amortization	33,435	29,428
Expense from acquisition activities	2,863	2,043
Southbridge Landfill closure charge	110	140
Total operating expenses	252,330	223,859
Operating income	10,265	10,168
Other expense (income):
Interest income	(684)	(40)
Interest expense	6,959	5,204
Other income	(349)	(144)
Other expense, net	5,926	5,020
Income before income taxes	4,339	5,148
Provision for income taxes	791	958
Net income	$ 3,548	$ 4,190
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding, basic (in shares)	51,770	51,490
Basic earnings per common share (in dollars per share)	$ 0.07	$ 0.08
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding, diluted (in shares)	51,869	51,657
Diluted earnings per common share (in dollars per share)	$ 0.07	$ 0.08