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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |
Net income | $ 91,106,000 | $ 31,653,000 | $ 6,420,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 90,782,000 | 79,790,000 | 70,508,000
Operating lease right-of-use assets expense | 8,476,000 | 9,559,000 | 0
Depletion of landfill operating lease obligations |  |  | 9,724,000
Interest accretion on landfill and environmental remediation liabilities | 7,090,000 | 6,976,000 | 5,708,000
Amortization of debt issuance costs and discount on long-term debt | 2,169,000 | 2,293,000 | 2,449,000
Stock-based compensation | 8,219,000 | 7,223,000 | 8,445,000
Loss (gain) on sale of property and equipment | 936,000 | (892,000) | (492,000)
Southbridge Landfill non-cash closure charge, net | 263,000 | 74,000 | 16,179,000
Southbridge Landfill insurance recovery for investing activities | 0 | 0 | (3,506,000)
Development project charge | 0 | 0 | 311,000
Non-cash expense from acquisition activities and other items | 554,000 | 65,000 | 757,000
Loss on debt extinguishment | 0 | 0 | 7,352,000
Impairment of investments | 0 | 0 | 1,069,000
Withdrawal costs - multiemployer pension plan | 0 | 2,230,000 | 0
Deferred income taxes | (52,288,000) | (1,244,000) | 1,250,000
Changes in assets and liabilities, net of effects of acquisitions and divestitures: |  |  |
Accounts receivable | 5,815,000 | (5,464,000) | (5,833,000)
Landfill operating lease contract expenditures | (5,386,000) | (5,307,000) | 0
Accounts payable | (15,226,000) | 6,762,000 | 9,091,000
Prepaid expenses, inventories and other assets | (1,211,000) | (1,669,000) | 535,000
Accrued expenses, contract liabilities and other liabilities | (9,158,000) | (22,931,000) | (9,133,000)
Net cash provided by operating activities | 139,922,000 | 116,829,000 | 120,834,000
Cash Flows from Investing Activities: |  |  |
Acquisitions, net of cash acquired | (32,457,000) | (75,379,000) | (88,918,000)
Additions to property, plant and equipment | (108,108,000) | (103,165,000) | (73,232,000)
Payments on landfill operating lease contracts | 0 | 0 | (7,415,000)
Proceeds from sale of property and equipment | 533,000 | 750,000 | 870,000
Proceeds from property insurance settlement | 0 | 332,000 | 992,000
Net cash used in investing activities | (140,032,000) | (177,462,000) | (164,197,000)
Cash Flows from Financing Activities: |  |  |
Proceeds from debt borrowings | 157,000,000 | 197,800,000 | 634,700,000
Principal payments on debt | (149,378,000) | (243,374,000) | (584,223,000)
Payments of debt issuance costs | (1,531,000) | (749,000) | (5,573,000)
Proceeds from the exercise of share based awards | 100,000 | 3,355,000 | 471,000
Proceeds from the public offering of Class A Common Stock | 144,790,000 | 100,446,000 | 0
Proceeds from unregistered sale of Class A Common Stock | 0 | 2,619,000 | 0
Net cash provided by financing activities | 150,981,000 | 60,097,000 | 45,375,000
Net increase (decrease) in cash and cash equivalents | 150,871,000 | (536,000) | 2,012,000
Cash and cash equivalents, beginning of period | 3,471,000 | 4,007,000 | 1,995,000
Cash and cash equivalents, end of period | 154,342,000 | 3,471,000 | 4,007,000
Supplemental Disclosures of Cash Flow Information: |  |  |
Interest | 20,117,000 | 23,183,000 | 23,523,000
Income tax (refunds) payments, net | (1,534,000) | (1,631,000) | 105,000
Supplemental Disclosures of Non-Cash Investing and Financing Activities: |  |  |
Non-current assets acquired through long-term obligations | 18,069,000 | 13,053,000 | 7,092,000
Landfills |  |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Operating lease right-of-use assets expense | 7,781,000 | 7,711,000 |
Cash Flows from Investing Activities: |  |  |
Proceeds from property insurance settlement | $ 0 | $ 0 | $ 3,506,000

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