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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flows from Operating Activities:    
Net loss $ (4,810) $ (4,117)
Adjustments to reconcile net loss to net cash provided by operating activities    
Depreciation and amortization 71,491 54,037
Interest accretion on landfill and environmental remediation liabilities 3,711 2,937
Amortization of debt issuance costs 754 741
Stock-based compensation 4,911 2,135
Operating lease right-of-use assets expense 4,729 4,070
Disposition of assets, other items and charges, net 243 320
Deferred income taxes (3,328) (2,425)
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable 5,618 10,529
Accounts payable (8,083) (36,505)
Prepaid expenses, inventories and other assets 2,246 3,739
Accrued expenses, contract liabilities and other liabilities (27,359) (27,782)
Net cash provided by operating activities 50,123 7,679
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (103,560) (294)
Additions to property and equipment (55,475) (30,251)
Proceeds from sale of property and equipment 216 488
Net cash used in investing activities (158,819) (30,057)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 25,000 875
Principal payments on debt (28,984) (9,952)
Payments of debt issuance costs (724) 0
Net cash used in financing activities (4,708) (9,077)
Net decrease in cash, cash equivalents, restricted cash and non-current restricted cash (113,404) (31,455)
Cash, cash equivalents and restricted cash, beginning of period 383,303 220,912
Cash, cash equivalents, restricted cash and non-current restricted cash, end of period 269,899 189,457
Cash paid during the period for:    
Cash interest payments 13,085 15,500
Cash income tax payments 752 1,681
Supplemental Disclosure of Non-Cash Activities:    
Right-of-use assets obtained in exchange for finance lease obligations 6,989 9,139
Right-of-use assets obtained in exchange for operating lease obligations $ 11,390 $ 1,613