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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |  |
Net income |  | $ 15,221,000 | $ 42,900,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, depletion, and amortization |  | 89,433,000 | 67,306,000
Deferred income tax expense |  | 5,368,000 | 4,689,000
Abandonment and impairment of unproved properties |  | 2,215,000 | 30,589,000
Stock-based compensation |  | 6,096,000 | 4,436,000
Non-cash lease component |  | 14,000 | (168,000)
Amortization of deferred financing costs |  | 963,000 | 772,000
Derivative (gain) loss |  | 133,613,000 | (64,603,000)
Derivative cash settlement gain (loss) |  | (50,536,000) | 42,494,000
(Gain) loss on property transactions, net |  | (951,000) | 1,398,000
Other |  | 0 | (1,166,000)
Changes in current assets and liabilities: |  |  |
Accounts receivable, net |  | (17,050,000) | 24,262,000
Prepaid expenses and other assets |  | 2,244,000 | 3,364,000
Accounts payable and accrued liabilities |  | 9,504,000 | (41,692,000)
Settlement of asset retirement obligations |  | (3,891,000) | (3,137,000)
Net cash provided by operating activities |  | 192,243,000 | 111,444,000
Cash flows from investing activities: |  |  |
Acquisition of oil and gas properties |  | (620,000) | (853,000)
Cash acquired |  | 49,827,000 | 0
Exploration and development of oil and gas properties |  | (104,207,000) | (56,216,000)
Additions to other property and equipment |  | (72,000) | (440,000)
Proceeds from note receivable |  | 204,000 | 0
Net cash used in investing activities |  | (54,868,000) | (57,509,000)
Cash flows from financing activities: |  |  |
Proceeds from credit facility |  | 155,000,000 | 45,000,000
Payments to credit facility |  | (249,000,000) | (105,000,000)
Proceeds from exercise of stock options |  | 716,000 | 0
Payment of employee tax withholdings in exchange for the return of common stock |  | (2,890,000) | (1,074,000)
Dividends paid |  | (21,598,000) | 0
Deferred financing costs |  | (3,915,000) | (13,000)
Principal payments on finance lease obligations |  | (21,000) | (71,000)
Net cash used in financing activities |  | (121,708,000) | (61,158,000)
Net change in cash, cash equivalents, and restricted cash |  | 15,667,000 | (7,223,000)
Cash, cash equivalents, and restricted cash: |  |  |
Beginning of period |  | 24,845,000 | 11,095,000
End of period |  | 40,512,000 | 3,872,000
Supplemental cash flow disclosure |  |  |
Cash paid for interest, net of capitalization | [1] | 1,684,000 | 1,472,000
Receivables exchanged for additional interests in oil and gas properties | [1] | 0 | 8,299,000
Changes in working capital related to drilling expenditures | [1] | $ (22,175,000) | $ 610,000
[1] | (1) Refer to Note 4 - Leases in the notes to the condensed consolidated financial statements for supplemental cash flows related to leases.

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