UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows from Operating Activities:
Net income	$ 3,548	$ 4,190
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,435	29,428
Interest accretion on landfill and environmental remediation liabilities	2,510	1,966
Amortization of debt issuance costs	502	457
Stock-based compensation	1,976	2,241
Operating lease right-of-use assets expense	3,328	3,162
Disposition of assets, other items and charges, net	1,315	860
Deferred income taxes	86	534
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	5,694	402
Accounts payable	(7,563)	2,116
Prepaid expenses, inventories and other assets	1,701	(1,060)
Accrued expenses, contract liabilities and other liabilities	(30,453)	(19,582)
Net cash provided by operating activities	16,079	24,714
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(263)	(49,757)
Additions to property, plant and equipment	(17,879)	(12,910)
Proceeds from sale of property and equipment	415	145
Net cash used in investing activities	(17,727)	(62,522)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	0	25,600
Principal payments on debt	(8,996)	(9,014)
Payments of debt issuance costs	(282)	(12)
Proceeds from the exercise of share based awards	0	19
Net cash (used in) provided by financing activities	(9,278)	16,593
Net decrease in cash and cash equivalents	(10,926)	(21,215)
Cash and cash equivalents, beginning of period	71,152	33,809
Cash and cash equivalents, end of period	60,226	12,594
Supplemental Disclosure of Cash Flow Information:
Cash interest payments	5,873	4,840
Cash income tax payments	4,807	221
Right-of-use assets obtained in exchange for new finance lease liabilities	1,634	1,032
Right-of-use assets obtained in exchange for operating lease obligations	$ 5,682	$ 2,710