Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash Flows from Operating Activities:
Net Income	$ 255,584	$ 498,825
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization	165,173	182,871
Gain on Sale of Assets	(6,960)	(7,082)
Stock-Based Compensation	9,406	8,461
Amortization of Debt Issuance Costs	2,812	4,534
Loss on Debt Extinguishment	0	2,725
Deferred Income Taxes	360	(837)
Other Adjustments to Net Income	(2,183)	(2,571)
Changes in Operating Assets:
Accounts and Notes Receivable	15,420	37,670
Inventories	(28,461)	(32,096)
Other Current Assets	1,844	(4,522)
Changes in Other Assets	(1,479)	(26,913)
Changes in Operating Liabilities:
Accounts Payable	4,298	7,759
Commodity Derivatives, net Liability	0	(15,142)
Other Operating Liabilities	(8,887)	28,751
Changes in Other Liabilities	(51,847)	(43,615)
Net Cash Provided by Operating Activities	355,080	638,818
Cash Flows from Investing Activities:
Capital Expenditures	(137,148)	(117,749)
Proceeds from Sales of Assets	7,320	6,240
Investments in Mining-Related Activities	(3,582)	(5,366)
Proceeds from Sales of Short-Term Investments	44,075	83,924
Purchases of Short-Term Investments	(43,265)	(162,422)
Other Investing Activity	(2,100)	(350)
Net Cash Used in Investing Activities	(134,700)	(195,723)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	(8,258)	(19,490)
Payments on Other Debt	(905)	(729)
Shares Withheld for Taxes	(5,540)	(12,746)
Repurchases of Common Stock	(70,879)	(277,382)
Debt-Related Financing Fees	0	(2,810)
Dividends and Dividend Equivalents Paid	(8,451)	(75,474)
Net Cash Used in Financing Activities	(94,033)	(554,053)
Net Increase (Decrease) in Cash and Cash Equivalents and Restricted Cash	126,347	(110,958)
Cash and Cash Equivalents and Restricted Cash at Beginning of Period	243,268	326,952
Cash and Cash Equivalents and Restricted Cash at End of Period	369,615	215,994
Non-Cash Investing and Financing Activities:
Finance Lease	3,248	588
Term Loan B Facility
Cash Flows from Financing Activities:
Payments on debt	0	(63,590)
Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Payments on debt	$ 0	$ (101,832)