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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
OPERATING ACTIVITIES    
Net income (loss) $ 443,241 $ (26,036)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and depletion 56,168 73,054
Deferred income tax expense 101,875 17,006
Stock based compensation expense 11,651 7,240
Amortization of debt issuance costs and debt discount 1,051 855
Accretion of asset retirement obligations 1,766 1,610
Mark-to-market loss on gas hedges 4,043 0
Changes in operating assets and liabilities:    
Trade accounts receivable (172,853) 18,139
Inventories (68,945) 33,048
Prepaid expenses and other receivables 10,241 10,495
Accounts payable (997) (12,313)
Accrued expenses and other current liabilities 6,761 (16,175)
Other 5,724 6,977
Net cash provided by operating activities 399,726 113,900
INVESTING ACTIVITIES    
Purchase of property, plant and equipment (78,702) (23,651)
Deferred mine development costs (21,129) (13,462)
Acquisition of leased mineral rights (3,500) 0
Acquisition of Black Warrior Methane and Black Warrior Transmission, net of $2.8 million cash acquired 2,533 0
Proceeds from sale of property, plant and equipment 0 192
Net cash used in investing activities (100,798) (36,921)
FINANCING ACTIVITIES    
Dividends paid (32,099) (5,229)
Principal repayments of finance lease obligations (14,100) (13,984)
Other (3,719) (2,806)
Net cash used in financing activities (49,918) (22,019)
Net increase in cash and cash equivalents 249,010 54,960
Cash and cash equivalents at beginning of period 395,839 211,916
Cash and cash equivalents at end of period $ 644,849 $ 266,876