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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