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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Cash Flows from Operating Activities: |  |
Net income (loss) | $ 10,201 | $ (2,206)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation and amortization | 37,204 | 33,370
Operating lease right-of-use assets expense | 4,921 |
Depletion of landfill operating lease obligations |  | 4,993
Interest accretion on landfill and environmental remediation liabilities | 3,579 | 2,862
Amortization of debt issuance costs and discount on long-term debt | 1,149 | 1,290
Stock-based compensation | 3,320 | 4,198
Gain on sale of property and equipment | (327) | (370)
Southbridge Landfill non-cash closure charge | 179 | 1,273
Development project charge | 0 | 311
Non-cash expense from acquisition activities and other items | (68) | 211
Loss on debt extinguishment | 0 | (7,352)
Deferred income taxes | (1,565) | (725)
Changes in assets and liabilities, net of effects of acquisitions and divestitures: |  |
Accounts receivable | (10,057) | (11,338)
Accounts payable | 3,995 | 6,425
Prepaid expenses, inventories and other assets | (2,975) | 2,617
Accrued expenses, contract liabilities and other liabilities | (14,928) | (2,184)
Net cash provided by operating activities | 38,251 | 48,079
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired | (27,687) | (19,369)
Additions to property, plant and equipment | (46,659) | (35,492)
Payments on landfill operating lease contracts | 0 | (3,467)
Proceeds from sale of property and equipment | 363 | 469
Net cash used in investing activities | (73,983) | (57,859)
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 41,400 | 528,900
Principal payments on long-term debt | (109,241) | (513,854)
Payments of debt issuance costs | 0 | (5,567)
Proceeds from the exercise of share based awards | 2,277 | 398
Proceeds from the issuance of Class A Common Stock | 100,446 | 0
Net cash provided by financing activities | 34,882 | 9,877
Net (decrease) increase in cash and cash equivalents | (850) | 97
Cash and cash equivalents, beginning of period | 4,007 | 1,995
Cash and cash equivalents, end of period | 3,157 | 2,092
Cash paid during the period for: |  |
Interest | 11,672 | 11,423
Income taxes, net of refunds | 16 | 84
Supplemental Disclosure of Non-Cash Investing and Financing Activities: |  |
Non-current assets obtained through long-term obligations | 9,333 | $ 3,267
Landfill |  |
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Operating lease right-of-use assets expense | $ 3,623 |

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