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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net income $ 126,995 $ 270,771
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 40,701 29,423
Amortization of acquired intangibles, net 1,675 2,197
Amortization of debt issuance costs and accretion of debt discount 280 534
Loss (gain) on disposal of assets 1,610 (2,363)
Accretion on asset retirement obligations 6,143 6,377
Employee benefit plans, net 3,833 3,261
Deferred income taxes 1,614 14,432
Stock-based compensation 2,769 3,034
Equity loss in affiliates 1,640 1,748
Other, net (197) 126
Changes in operating assets and liabilities 9,011 (152,153)
Net cash provided by operating activities 196,074 177,387
Investing activities:    
Capital expenditures (63,618) (74,248)
Proceeds on disposal of assets 287 3,478
Cash paid for business acquired 0 (11,919)
Purchases of investment securities (7,230) (141,750)
Sales and maturities of investment securities 10,172 204,660
Capital contributions to equity affiliates (8,476) (8,124)
Other, net 6 12
Net cash used in investing activities (68,859) (27,891)
Financing activities:    
Principal repayments of long-term debt (632) (438)
Dividend and dividend equivalents paid (3,000) (85,979)
Common stock repurchases and related expenses (116,089) (144,919)
Other, net (306) (116)
Net cash used in financing activities (120,027) (231,452)
Net increase (decrease) in cash and cash equivalents and restricted cash 7,188 (81,956)
Cash and cash equivalents and restricted cash at beginning of period 384,125 355,394
Cash and cash equivalents and restricted cash at end of period 391,313 273,438
Supplemental disclosure of noncash investing and financing activities:    
Financing leases and capital financing - equipment 0 1,753
Accrued capital expenditures 14,525 13,703
Accrued common stock repurchases and stock repurchase excise tax 4,665 5,995
Accrued dividend payable 525 8,973
Reconciliation of Cash and Cash Equivalents and Restricted Cash    
Cash and cash equivalents 269,386 222,507
Long-term restricted cash 121,927 50,931
Total cash and cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows $ 391,313 $ 273,438