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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
OPERATING ACTIVITIES      
Net income $ 250,603 $ 478,629 $ 641,298
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and depletion 153,982 127,356 115,279
Deferred income tax (benefit) expense (8,052) 52,871 141,806
Stock-based compensation expense 22,070 18,207 17,621
Mark-to-market loss on gas hedges 1,835 0 4,043
Amortization of debt issuance costs and debt discount 1,590 2,094 3,165
Accretion and valuation adjustment of ARO 5,435 4,535 1,941
Loss on early extinguishment of debt 0 11,699 0
Changes in operating assets and liabilities:      
Trade accounts receivable (42,642) 53,601 (29,676)
Other receivables 3,651 1,187 7,225
Income tax receivable 7,833 (7,833) 0
Inventories (18,495) (30,785) (79,845)
Prepaid expenses and other current assets (4,155) (2,034) 888
Accounts payable (2,551) 215 (5,442)
Accrued expenses and other current liabilities 1,207 (8,645) 22,803
Other (4,863) 11 798
Net cash provided by operating activities 367,448 701,108 841,904
INVESTING ACTIVITIES      
Purchase of property, plant and equipment (457,221) (491,674) (205,242)
Deferred mine development costs (31,060) (33,112) (48,935)
Purchase of investments (49,721) 0 0
Acquisition of leased mineral rights 0 0 (3,500)
Acquisitions, net of cash acquired 0 (2,421) 2,533
Net cash used in investing activities (538,002) (527,207) (255,144)
FINANCING ACTIVITIES      
Dividends paid (43,823) (61,077) (79,665)
Retirements of debt 0 (162,358) (39,382)
Proceeds from financing lease obligations 4,503 0 0
Principal repayments of financing lease obligations (17,414) (32,330) (30,348)
Other (11,777) (9,419) (3,724)
Net cash used in financing activities (68,511) (265,184) (153,119)
Net (decrease) increase in cash and cash equivalents (239,065) (91,283) 433,641
Cash, cash equivalents, and restricted cash at beginning of period 738,197 829,480 395,839
Cash, cash equivalents, and restricted cash at end of period 499,132 738,197 829,480
Cash and cash equivalents 491,547 738,197 829,480
Restricted cash 7,585 0 0
Cash, cash equivalents, restricted cash and restricted cash equivalents, total 499,132 738,197 829,480
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid, net of capitalized interest 13,621 23,970 27,810
Cash paid for income taxes 26,500 27,004 0
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:      
Financing leases - equipment $ 12,147 $ 11,312 $ 8,150