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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
OPERATING ACTIVITIES |  |
Net income (loss) | $ 12,391 | $ (2,050)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation and depletion | 102,021 | 78,813
Deferred income tax expense (benefit) | 22,439 | (9,268)
Stock based compensation expense | 8,763 | 5,634
Amortization of debt issuance costs and debt discount/premium, net | 1,289 | 1,125
Accretion of asset retirement obligations | 2,416 | 2,198
Mark-to-market loss on gas hedges | 8,661 | 0
Changes in operating assets and liabilities: |  |
Trade accounts receivable | 10,028 | 18,054
Income tax receivable | 0 | 24,274
Inventories | 18,703 | (43,887)
Prepaid expenses and other receivables | 10,548 | (5,906)
Accounts payable | (16,746) | 11,169
Accrued expenses and other current liabilities | (10,100) | (4,699)
Other | 6,417 | 6,696
Net cash provided by operating activities | 176,830 | 82,153
INVESTING ACTIVITIES |  |
Purchase of property, plant and equipment | (34,149) | (72,059)
Deferred mine development costs | (13,462) | (13,257)
Proceeds from sale of property, plant and equipment | 192 | 0
Sale of short-term investments | 0 | 14,733
Purchases of short-term investments | 0 | (8,500)
Net cash used in investing activities | (47,419) | (79,083)
FINANCING ACTIVITIES |  |
Dividends paid | (7,842) | (7,796)
Borrowings under ABL Facility | 0 | 70,000
Repayments under ABL Facility | (40,000) | (30,000)
Principal repayments of finance lease obligations | (22,284) | (10,972)
Other | (2,806) | (1,272)
Net cash (used in) provided by financing activities | (72,932) | 19,960
Net increase in cash and cash equivalents | 56,479 | 23,030
Cash and cash equivalents at beginning of period | 211,916 | 193,383
Cash and cash equivalents at end of period | $ 268,395 | $ 216,413

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