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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating activities:    
Net (loss) income $ (33,947) $ 126,995
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and amortization 43,910 40,701
Amortization of acquired intangibles, net 1,357 1,675
Amortization of debt issuance costs and accretion of debt discount 280 280
(Gain) loss on disposal of assets (37) 1,610
Accretion on asset retirement obligations 5,614 6,143
Employee benefit plans, net 5,618 3,833
Deferred income taxes (11,416) 1,614
Stock-based compensation 3,437 2,769
Equity loss in affiliates 4,960 1,640
Other, net (145) (197)
Changes in operating assets and liabilities 2,550 9,011
Net cash provided by operating activities 22,181 196,074
Investing activities:    
Capital expenditures (38,450) (63,618)
Proceeds on disposal of assets 81 287
Purchases of investment securities (14,663) (7,230)
Sales and maturities of investment securities 15,080 10,172
Capital contributions to equity affiliates (9,836) (8,476)
Other, net 13 6
Net cash used in investing activities (47,775) (68,859)
Financing activities:    
Principal repayments of long-term debt (480) (632)
Dividend and dividend equivalents paid (415) (3,000)
Common stock repurchases and related expenses (5,155) (116,089)
Other, net (342) (306)
Net cash used in financing activities (6,392) (120,027)
Net (decrease) increase in cash and cash equivalents and restricted cash (31,986) 7,188
Cash and cash equivalents and restricted cash at beginning of period 604,161 384,125
Cash and cash equivalents and restricted cash at end of period 572,175 391,313
Supplemental disclosure of noncash investing and financing activities:    
Accrued capital expenditures 10,785 14,525
Accrued common stock repurchases and stock repurchase excise tax 0 4,665
Accrued dividend payable $ 90 $ 525