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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash Flows from Operating Activities:    
Net income $ 44,658 $ 31,955
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 93,106 74,510
Interest accretion on landfill and environmental remediation liabilities 6,018 5,915
Amortization of debt issuance costs 1,414 1,716
Stock-based compensation 5,589 8,712
Operating lease right-of-use assets expense 10,405 9,981
Gain on sale of property and equipment (580) 0
Non-cash expense from acquisition activities 298 532
Deferred income taxes 13,819 12,974
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable (14,230) (10,943)
Landfill operating lease contract expenditures (3,336) (3,646)
Accounts payable 7,946 20,318
Prepaid expenses, inventories and other assets (5,799) (14,391)
Accrued expenses, contract liabilities and other liabilities (6,877) (3,544)
Net cash provided by operating activities 152,431 134,089
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (73,963) (153,112)
Additions to property, plant and equipment (87,667) (81,577)
Proceeds from sale of property and equipment 571 593
Net cash used in investing activities (161,059) (234,096)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 82,200 500
Principal payments on debt (57,407) (8,517)
Payments of debt issuance costs (1,232) 0
Payments of contingent consideration (1,000) 0
Proceeds from the exercise of share based awards 192 163
Net cash provided by (used in) financing activities 22,753 (7,854)
Net increase (decrease) in cash and cash equivalents 14,125 (107,861)
Cash and cash equivalents, beginning of period 33,809 154,342
Cash and cash equivalents, end of period 47,934 46,481
Supplemental Disclosure of Cash Flow Information:    
Cash interest payments 14,750 14,378
Cash income tax payments 2,875 597
Right-of-use assets obtained in exchange for new finance lease liabilities 9,420 18,153
Right-of-use assets obtained in exchange for operating lease obligations $ 7,672 $ 3,566