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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash Flows from Operating Activities:    
Net income $ 21,986 $ 16,094
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 60,579 47,019
Interest accretion on landfill and environmental remediation liabilities 4,015 3,962
Amortization of debt issuance costs 924 1,144
Stock-based compensation 3,178 6,057
Operating lease right-of-use assets expense 6,824 6,407
Gain on sale of property and equipment (269) (92)
Non-cash expense from acquisition activities 645 1,022
Deferred income taxes 7,156 7,041
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable (14,667) (4,712)
Landfill operating lease contract expenditures (1,308) (1,478)
Accounts payable 10,142 10,866
Prepaid expenses, inventories and other assets (6,099) (7,192)
Accrued expenses, contract liabilities and other liabilities (855) (7,125)
Net cash provided by operating activities 92,251 79,013
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (56,250) (5,481)
Additions to property, plant and equipment (54,868) (56,069)
Proceeds from sale of property and equipment 507 403
Net cash used in investing activities (110,611) (61,147)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 82,200 500
Principal payments on debt (55,297) (5,643)
Payments of debt issuance costs (1,229) 0
Payments of contingent consideration (1,000) 0
Proceeds from the exercise of share based awards 192 112
Net cash provided by (used in) financing activities 24,866 (5,031)
Net increase in cash and cash equivalents 6,506 12,835
Cash, cash equivalents and restricted cash, beginning of period 33,809 154,342
Cash, cash equivalents and restricted cash, end of period 40,315 167,177
Supplemental Disclosure of Cash Flow Information:    
Cash interest payments 9,648 9,701
Cash income tax payments 2,092 411
Non-current assets obtained through long-term financing obligations 4,190 5,894
Right-of-use assets obtained in exchange for operating lease obligations $ 5,194 $ 1,251