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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Operating activities:    
Net loss $ (23,284) $ (38,901)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and amortization 75,970 88,732
Amortization of acquired intangibles 1,752 2,714
(Gain) loss on disposal of assets, net (2,071) 138
Accretion on asset retirement obligations 10,429 11,122
Employee benefit plans, net 14,646 11,628
Deferred tax benefit (11,932) (12,663)
Stock-based compensation 7,972 7,455
Equity loss in affiliates 12,450 13,696
Other, net 2,250 365
Changes in operating assets and liabilities (19,272) (8,874)
Net cash provided by operating activities 68,910 75,412
Investing activities:    
Capital expenditures (85,816) (73,092)
Capital contributions to equity affiliates (23,325) (23,509)
Purchases of investment securities (48,886) (29,303)
Sales and maturities of investment securities 68,327 30,630
Other, net 2,139 107
Net cash used in investing activities (87,561) (95,167)
Financing activities:    
Principal repayments of long-term debt (1,620) (1,561)
Common stock repurchases and related expenses (36,728) (5,155)
Other, net (72) (2,557)
Net cash used in financing activities (38,420) (9,273)
Net decrease in cash and cash equivalents and restricted cash (57,071) (29,028)
Cash and cash equivalents and restricted cash at beginning of period 492,885 604,161
Cash and cash equivalents and restricted cash at end of period 435,814 575,133
Supplemental disclosure of noncash investing and financing activities:    
Accrued capital expenditures $ 10,967 $ 7,831