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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash Flows from Operating Activities: |  |
Net income | $ 13,072 | $ 10,201
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 43,482 | 37,204
Operating lease right-of-use assets expense | 4,588 | 4,921
Interest accretion on landfill and environmental remediation liabilities | 3,542 | 3,579
Amortization of debt issuance costs | 1,054 | 1,149
Stock-based compensation | 3,380 | 3,320
Loss (gain) on sale of property and equipment | 131 | (327)
Southbridge Landfill non-cash closure charge | 41 | 179
Non-cash expense from acquisition activities | 575 | (68)
Deferred income taxes | 1,256 | (1,565)
Changes in assets and liabilities, net of effects of acquisitions and divestitures: |  |
Accounts receivable | 6,448 | (10,057)
Landfill operating lease contract expenditures | (1,358) | (2,140)
Accounts payable | (6,967) | 3,995
Prepaid expenses, inventories and other assets | (2,309) | (2,975)
Accrued expenses, contract liabilities and other liabilities | (7,910) | (12,788)
Net cash provided by operating activities | 62,493 | 38,251
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (20,091) | (27,687)
Additions to property, plant and equipment | (51,570) | (46,659)
Proceeds from sale of property and equipment | 200 | 363
Net cash used in investing activities | (71,461) | (73,983)
Cash Flows from Financing Activities: |  |
Proceeds from debt borrowings | 91,200 | 41,400
Principal payments on debt | (82,719) | (109,241)
Payments of debt issuance costs | (11) | 0
Proceeds from the exercise of share based awards | 100 | 2,277
Proceeds from the public issuance of Class A Common Stock | 0 | 100,446
Net cash provided by financing activities | 8,570 | 34,882
Net decrease in cash and cash equivalents | (398) | (850)
Cash and cash equivalents, beginning of period | 3,471 | 4,007
Cash and cash equivalents, end of period | 3,073 | 3,157
Cash paid during the period for: |  |
Interest | 10,733 | 11,672
Income taxes, net of refunds | 187 | 16
Supplemental Disclosure of Non-Cash Investing and Financing Activities: |  |
Non-current assets obtained through long-term obligations | 11,859 | 9,333
Landfill |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Operating lease right-of-use assets expense | $ 3,468 | $ 3,623

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