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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash Flows from Operating Activities:      
Net income $ 25,399 $ 53,079 $ 41,100
net income to net cash provided by operating activities:      
Depreciation and amortization 170,705 126,351 103,590
Interest accretion on landfill and environmental remediation liabilities 9,885 8,008 7,324
Amortization of debt issuance costs 2,962 1,903 2,288
Stock-based compensation 9,084 8,155 11,551
Operating lease right-of-use assets expense 15,318 13,804 13,827
Disposition of assets, other items and charges, net 708 737 1,055
Loss from termination of bridge financing 8,191 0 0
Landfill capping charge - veneer failure 3,021 0 0
Deferred income taxes 7,392 16,527 15,073
Changes in assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable (39,436) (7,101) (7,422)
Landfill operating lease contract expenditures (5,496) (5,486) (5,655)
Accounts payable 41,592 11,075 13,888
Prepaid expenses, inventories and other assets (8,172) (11,054) (6,343)
Accrued expenses, contract liabilities and other liabilities (8,061) 1,316 (7,539)
Net cash provided by operating activities 233,092 217,314 182,737
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (851,839) (78,197) (170,647)
Additions to property and equipment (154,907) (130,960) (123,295)
Proceeds from sale of cost method investment 0 1,637 0
Proceeds from sale of property and equipment 1,110 600 788
Net cash used in investing activities (1,005,636) (206,920) (293,154)
Cash Flows from Financing Activities:      
Proceeds from debt borrowings 465,000 88,200 3,701
Principal payments on debt (26,257) (59,211) (10,305)
Payments of debt issuance costs (12,759) (1,232) (3,684)
Payments of contingent consideration 0 (1,000) 0
Proceeds from the exercise of share based awards 89 192 172
Proceeds from the public offering of Class A Common Stock 496,231 0 0
Net cash provided by (used in) financing activities 922,304 26,949 (10,116)
Net increase (decrease) in cash and cash equivalents 149,760 37,343 (120,533)
Cash and cash equivalents, beginning of period 71,152 33,809 154,342
Cash and cash equivalents, end of period 220,912 71,152 33,809
Supplemental Disclosures of Cash Flow Information:      
Interest 43,588 21,003 19,025
Income tax payments, net 10,109 2,798 1,438
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Non-current assets acquired through long-term financing obligations $ 12,322 $ 11,919 $ 20,753