Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities:
Net Income	$ (1,821)	$ 97,196
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization	161,315	155,347
Stock-Based Compensation	26,069	16,252
(Gain) Loss on Sale of Assets	(2,176)	(19,713)
Amortization of Mineral Leases	503	1,886
Deferred Income Taxes	305	(2,265)
Equity in Earnings of Affiliates	(4,797)	(7,935)
Changes in Operating Assets:
Accounts and Notes Receivable	27,137	(17,990)
Inventories	30,732	(26,662)
Prepaid Expenses	7,944	6,231
Changes in Other Assets	6,749	10,837
Changes in Operating Liabilities:
Accounts Payable	(26,474)	(39,312)
Other Operating Liabilities	19,940	62,233
Changes in Other Liabilities	16,652	(8,928)
Other	6,202	2,309
Net Cash Provided by Operating Activities	268,280	229,486
Investing Activities:
Capital Expenditures	(405,972)	(306,446)
Increase (Decrease) in Restricted Cash	48,294	0
Proceeds from Sales of Assets	138,636	28,611
Net Investment in Equity Affiliates	(12,500)	(10,250)
Net Cash Used in Investing Activities	(231,542)	(288,085)
Financing Activities:
Payments on Miscellaneous Borrowings	(27,601)	(2,330)
Payments on Securitzation Facility	(7,727)	0
Tax Benefit from Stock-Based Compensation	730	750
Dividends Paid	0	(28,387)
Proceeds from Issuance of Common Stock	909	54
Issuance of Treasury Stock	0	109
Debt Issuance and Financing Fees	131	(20)
Net Cash (Used in) Provided by Financing Activities	(33,558)	(29,824)
Net Increase in Cash and Cash Equivalents	3,180	(88,423)
Cash and Cash Equivalents at Beginning of Period	21,878	375,736
Cash and Cash Equivalents at End of Period	$ 25,058	$ 287,313