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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash Flows from Operating Activities:    
Net (loss) income $ (4,117) $ 3,548
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 54,037 33,435
Interest accretion on landfill and environmental remediation liabilities 2,937 2,510
Amortization of debt issuance costs 741 502
Stock-based compensation 2,135 1,976
Operating lease right-of-use assets expense 4,070 3,328
Disposition of assets, other items and charges, net 320 1,315
Deferred income taxes (2,425) 86
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable 10,529 5,694
Accounts payable (36,505) (7,563)
Prepaid expenses, inventories and other assets 3,739 1,701
Accrued expenses, contract liabilities and other liabilities (27,782) (30,453)
Net cash provided by operating activities 7,679 16,079
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (294) (263)
Additions to property and equipment (30,251) (17,879)
Proceeds from sale of property and equipment 488 415
Net cash used in investing activities (30,057) (17,727)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 875 0
Principal payments on debt (9,952) (8,996)
Payments of debt issuance costs 0 (282)
Net cash used in financing activities (9,077) (9,278)
Net decrease in cash and cash equivalents (31,455) (10,926)
Cash and cash equivalents, beginning of period 220,912 71,152
Cash and cash equivalents, end of period 189,457 60,226
Cash paid during the period for:    
Cash interest payments 15,500 5,873
Cash income tax payments 1,681 4,807
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right-of-use assets obtained in exchange for financing lease obligations 9,139 1,634
Right-of-use assets obtained in exchange for operating lease obligations $ 1,613 $ 5,682