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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Operating activities: |  |
Net income | $ 29,235 | $ 23,121
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 19,309 | 12,141
Impairment of intangible asset | 7,628 | 0
Amortization of intangible assets | 1,199 | 572
Asset retirement obligation settlement | (2,348) | (2,219)
(Gain) loss on disposal of assets | (41) | 253
Amortization of deferred financing cost | 172 | 223
Accretion of debt discount | 517 | 181
Deferred income taxes | 6,787 | 7,258
Stock-based compensation, net | 2,196 | 2,133
Employee stock purchase plan compensation | 30 | 56
Change in contingent consideration fair value | (2,757) | (2,100)
Changes in assets and liabilities, net of effects of acquisitions: |  |
Accounts receivable | (39,760) | (6,386)
Unbilled receivables | 6,634 | (23)
Inventories | 2,649 | (5,170)
Prepaid expenses and other assets | 1,035 | (3,087)
Deferred revenue | 4,396 | 4,030
Accounts payable | (956) | (2,517)
Accrued and other expenses | 4,403 | 5,257
Net cash provided by operating activities | 40,328 | 33,723
Investing activities: |  |
Acquisition of businesses, net of cash acquired | 0 | (29,921)
Purchases of property, plant and equipment | (19,518) | (81,654)
Proceeds from disposal of assets | 0 | 22
Net cash used in investing activities | (19,518) | (111,553)
Financing activities: |  |
Proceeds from the issuance of notes payable | 6,120 | 0
Repayments of notes payable | (1,461) | (288)
Payments under equipment financing obligations | (79) | (166)
Payment of deferred financing and debt issuance costs | (1,087) | (210)
Proceeds from revolving credit facility | 37,750 | 71,500
Repayment of revolving credit facility | (59,750) | (27,000)
Payment of contingent consideration | (1,610) | 0
Proceeds from equity issuance | 78 | 127
Purchase of treasury stock | (139) | (174)
Net cash (used in) provided by financing activities | (20,178) | 43,789
Effect of exchange rate changes on cash and cash equivalents | 0 | 0
Net decrease in cash and cash equivalents | 632 | (34,041)
Cash and cash equivalents at beginning of year | 1,466 | 35,227
Cash and cash equivalents at end of period | 2,098 | 1,186
Non-cash investing activities: |  |
Contingent consideration | 0 | 9,200
Asset retirement obligation | 3,301 | 1,561
Non-cash financing activities: |  |
Write-off of remaining balance of returned equipment under capital lease | 0 | 398
Capitalized expenditures in accounts payable and accrued expenses | $ 2,138 | $ 7,920

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