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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |
Net income | $ 37,954 | $ 31,623 | $ 20,101
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, depletion and accretion of asset retirement obligation | 22,130 | 26,425 | 17,159
Impairment loss | 5,115 | 15,542 | 17,835
Amortization of intangible assets | 793 | 1,394 | 1,002
Asset retirement obligation settlement | 0 | (2,753) | (3,180)
Loss (gain) on disposal of assets | 237 | (42) | 321
Loss on extinguishment of debt | 0 | 561 | 0
Provision for bad debt | 0 | 0 | 42
Amortization of deferred financing cost | 105 | 212 | 300
Accretion of debt discount | 185 | 649 | 246
Deferred income taxes | (2,573) | 6,123 | 5,046
Stock-based compensation | 3,831 | 2,909 | 2,937
Employee stock purchase plan compensation | 34 | 41 | 72
Change in contingent consideration fair value | (1,410) | (3,272) | (1,858)
Gain on bargain purchase | 39,291 | 0 | 0
Changes in assets and liabilities: |  |  |
Accounts receivable | (10,719) | (41,063) | 4,457
Unbilled receivables | 4,638 | 3,058 | (6,631)
Inventories | 4,738 | (1,021) | (7,343)
Prepaid expenses and other assets | (5,327) | 1,879 | (3,561)
Deferred revenue | 1,032 | 5,229 | 4,095
Accounts payable | (370) | (4,680) | (2,271)
Accrued and other expenses | 4,981 | 1,277 | 2,140
Income taxes payable | (542) | 542 | 0
Net cash provided by operating activities | 25,541 | 44,632 | 50,909
Investing activities: |  |  |
Acquisition of businesses, net of cash acquired | 0 | 0 | (29,921)
Purchases of property, plant and equipment | (8,620) | (25,525) | (96,090)
Proceeds from disposal of assets | 61 | 100 | 22
Net cash used in investing activities | (8,559) | (25,425) | (125,989)
Financing activities: |  |  |
Proceeds from the issuance of notes payable | 952 | 31,202 | 0
Repayments of notes payable | (4,802) | (2,808) | (559)
Payments under equipment financing obligations | (123) | (103) | (168)
Payment of deferred financing and debt issuance costs | (20) | (2,262) | (233)
Proceeds from revolving credit facility | 6,000 | 52,750 | 84,000
Repayment of revolving credit facility | (8,500) | (94,750) | (39,500)
Payment of contingent consideration | (310) | (1,995) | (175)
Proceeds from equity issuance | 62 | 71 | 127
Purchase of treasury stock | (1,155) | (140) | (2,173)
Net cash (used in) provided by financing activities | (7,896) | (18,035) | 41,319
Net increase (decrease) in cash and cash equivalents | 9,086 | 1,173 | (33,761)
Cash and cash equivalents at beginning of year | 2,639 | 1,466 | 35,227
Cash and cash equivalents at end of year | $ 11,725 | $ 2,639 | $ 1,466

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