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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash Flows from Operating Activities: |  |  |
Net income | $ 41,100 | $ 91,106 | $ 31,653
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 103,590 | 90,782 | 79,790
Interest accretion on landfill and environmental remediation liabilities | 7,324 | 7,090 | 6,976
Amortization of debt issuance costs on long-term debt | 2,288 | 2,169 | 2,293
Stock-based compensation | 11,551 | 8,219 | 7,223
Operating lease right-of-use assets expense | 13,827 | 16,257 | 17,270
Loss (gain) on sale of property and equipment | 172 | 936 | (892)
Southbridge Landfill non-cash closure (credit) charge, net | (356) | 263 | 74
Non-cash expense from acquisition activities | 315 | 554 | 65
Environmental remediation charge | 924 | 0 | 0
Withdrawal costs - multiemployer pension plan | 0 | 0 | 2,230
Deferred income taxes | 15,073 | (52,288) | (1,244)
Changes in assets and liabilities, net of effects of acquisitions and divestitures: |  |  |
Accounts receivable | (7,422) | 5,815 | (5,464)
Landfill operating lease contract expenditures | (5,655) | (5,386) | (5,307)
Accounts payable | 13,888 | (15,226) | 6,762
Prepaid expenses, inventories and other assets | (6,343) | (1,211) | (1,669)
Accrued expenses, contract liabilities and other liabilities | (7,539) | (9,158) | (22,931)
Net cash provided by operating activities | 182,737 | 139,922 | 116,829
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired | (170,647) | (32,457) | (75,379)
Additions to property, plant and equipment | (123,295) | (108,108) | (103,165)
Proceeds from sale of property and equipment | 788 | 533 | 750
Proceeds from property insurance settlement | 0 | 0 | 332
Net cash used in investing activities | (293,154) | (140,032) | (177,462)
Cash Flows from Financing Activities: |  |  |
Proceeds from debt borrowings | 3,701 | 157,000 | 197,800
Principal payments on debt | (10,305) | (149,378) | (243,374)
Payments of debt issuance costs | (3,684) | (1,531) | (749)
Proceeds from the exercise of share based awards | 172 | 100 | 3,355
Proceeds from the public offering of Class A Common Stock | 0 | 144,790 | 100,446
Proceeds from unregistered sale of Class A Common Stock | 0 | 0 | 2,619
Net cash (used in) provided by financing activities | (10,116) | 150,981 | 60,097
Net (decrease) increase in cash and cash equivalents | (120,533) | 150,871 | (536)
Cash and cash equivalents, beginning of period | 154,342 | 3,471 | 4,007
Cash and cash equivalents, end of period | 33,809 | 154,342 | 3,471
Supplemental Disclosures of Cash Flow Information: |  |  |
Interest | 19,025 | 20,117 | 23,183
Income tax payments (refunds), net | 1,438 | (1,534) | (1,631)
Supplemental Disclosures of Non-Cash Investing and Financing Activities: |  |  |
Non-current assets acquired through long-term financing obligations | $ 20,753 | $ 18,069 | $ 13,053

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