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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Cash Flows from Operating Activities: |  |
Net income | $ 9,038 | $ 21,986
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 68,359 | 60,579
Interest accretion on landfill and environmental remediation liabilities | 5,001 | 4,015
Amortization of debt issuance costs | 1,505 | 924
Stock-based compensation | 4,341 | 3,178
Operating lease right-of-use assets expense | 6,872 | 6,824
Disposition of assets, other items and charges, net | (300) | 376
Loss from termination of bridge financing | 8,198 | 0
Deferred income taxes | 1,952 | 7,156
Changes in assets and liabilities, net of effects of acquisitions and divestitures: |  |
Accounts receivable | (3,958) | (14,667)
Landfill operating lease contract expenditures | (1,318) | (1,308)
Accounts payable | 8,898 | 10,142
Prepaid expenses, inventories and other assets | (5,845) | (6,099)
Accrued expenses, contract liabilities and other liabilities | (19,547) | (855)
Net cash provided by operating activities | 83,196 | 92,251
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (547,587) | (56,250)
Additions to property, plant and equipment | (50,415) | (54,868)
Proceeds from sale of property and equipment | 776 | 507
Net cash used in investing activities | (597,226) | (110,611)
Cash Flows from Financing Activities: |  |
Proceeds from debt borrowings | 430,000 | 82,200
Principal payments on debt | (10,625) | (55,297)
Payments of debt issuance costs | (7,185) | (1,229)
Payments of contingent consideration | 0 | (1,000)
Proceeds from the exercise of share based awards | 0 | 192
Proceeds from the public offering of Class A common stock | 496,403 | 0
Net cash provided by financing activities | 908,593 | 24,866
Net increase in cash and cash equivalents | 394,563 | 6,506
Cash and cash equivalents, beginning of period | 71,152 | 33,809
Cash and cash equivalents, end of period | 465,715 | 40,315
Supplemental Disclosure of Cash Flow Information: |  |
Cash interest payments | 14,196 | 9,648
Cash income tax payments | 7,913 | 2,092
Non-current assets obtained through long-term financing obligations | 4,715 | 4,190
Right-of-use assets obtained in exchange for operating lease obligations | $ 17,756 | $ 5,194

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