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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash Flows from Operating Activities:    
Net income $ 27,210 $ 44,658
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 116,095 93,106
Interest accretion on landfill and environmental remediation liabilities 7,470 6,018
Amortization of debt issuance costs 2,221 1,414
Stock-based compensation 6,699 5,589
Operating lease right-of-use assets expense 10,956 10,405
Disposition of assets, other items and charges, net 279 (282)
Loss from termination of bridge financing 8,191 0
Deferred income taxes 5,233 13,819
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable (23,298) (14,230)
Landfill operating lease contract expenditures (3,336) (3,336)
Accounts payable 24,568 7,946
Prepaid expenses, inventories and other assets (10,112) (5,799)
Accrued expenses, contract liabilities and other liabilities (14,351) (6,877)
Net cash provided by operating activities 157,825 152,431
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (847,763) (73,963)
Additions to property, plant and equipment (90,364) (87,667)
Proceeds from sale of property and equipment 971 571
Net cash used in investing activities (937,156) (161,059)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 465,000 82,200
Principal payments on debt (18,563) (57,407)
Payments of debt issuance costs (12,759) (1,232)
Payments of contingent consideration 0 (1,000)
Proceeds from the exercise of share based awards 89 192
Proceeds from the public offering of Class A common stock 496,231 0
Net cash provided by financing activities 929,998 22,753
Net increase in cash and cash equivalents 150,667 14,125
Cash, cash equivalents and restricted cash, beginning of period 71,152 33,809
Cash, cash equivalents and restricted cash, end of period 221,819 47,934
Cash paid during the period for:    
Cash interest payments 28,626 14,750
Cash income tax payments 9,689 2,875
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Non-current assets obtained through long-term financing obligations 8,053 9,420
Right-of-use assets obtained in exchange for operating lease obligations $ 18,558 $ 7,672