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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash Flows from Operating Activities:    
Net income $ 4,190 $ 4,311
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 29,428 22,682
Interest accretion on landfill and environmental remediation liabilities 1,966 1,957
Amortization of debt issuance costs 457 572
Stock-based compensation 2,241 2,941
Operating lease right-of-use assets expense 3,162 3,015
Gain on sale of property and equipment (77) (24)
Non-cash expense from acquisition activities 937 146
Deferred income taxes 534 2,300
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable 402 7,872
Landfill operating lease contract expenditures 0 (160)
Accounts payable 2,116 1,349
Prepaid expenses, inventories and other assets (1,060) (2,077)
Accrued expenses, contract liabilities and other liabilities (19,582) (12,737)
Net cash provided by operating activities 24,714 32,147
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (49,757) (4,568)
Additions to property, plant and equipment (12,910) (26,832)
Proceeds from sale of property and equipment 145 123
Net cash used in investing activities (62,522) (31,277)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 25,600 0
Principal payments on debt (9,014) (2,769)
Payments of debt issuance costs (12) 0
Proceeds from the exercise of share based awards 19 112
Net cash provided by (used in) financing activities 16,593 (2,657)
Net decrease in cash and cash equivalents (21,215) (1,787)
Cash and cash equivalents, beginning of period 33,809 154,342
Cash and cash equivalents, end of period 12,594 152,555
Supplemental Disclosure of Cash Flow Information:    
Cash interest payments 4,840 5,020
Cash income tax payments 221 238
Non-current assets obtained through long-term financing obligations 1,032 4,569
Right-of-use assets obtained in exchange for operating lease liabilities $ 2,710 $ 512