Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities:
Net Income (Loss)	$ 632,497	$ 358,626	$ 567,142
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization	618,397	567,663	437,417
Impairment of Long-Lived Assets to be Disposed of	115,817	0	0
Share-based Compensation	48,842	47,593	39,032
(Gain) Loss on Sale of Assets	(46,497)	(9,908)	(15,121)
Gains (Losses) on Extinguishment of Debt	16,090	0	0
Amortization of Mineral Leases	7,608	4,160	3,970
Deferred Income Tax Expense (Benefit)	(53,011)	17,029	47,430
Equity in Earnings of Affiliates	(24,663)	(21,428)	(15,707)
Changes in Operating Assets:
Accounts and Notes Receivable	(83,770)	(96,245)	84,597
Inventories	(380)	48,919	(79,787)
Prepaid Expenses	4,431	(20,974)	10,730
Changes in Other Assets	17,745	7,237	(724)
Changes in Operating Liabilities:
Accounts Payable	144,652	78,839	(70,458)
Other Operating Liabilities	84,146	129,230	80,527
Changes in Other Liabilities	30,309	(15,443)	(45,883)
Other	15,393	36,014	17,286
Net Cash Provided by Operating Activities	1,527,606	1,131,312	1,060,451
Investing Activities:
Capital Expenditures	(1,382,371)	(1,154,024)	(920,080)
Payments to Acquire Businesses, Net of Cash Acquired	0	(3,470,212)	0
Payments to Acquire Additional Interest in Subsidiaries	0	(991,034)	0
Proceeds from Sales of Assets	747,971	59,844	69,884
Net Investment in Equity Affiliates	55,876	11,452	4,855
Net Cash Used in Investing Activities	(578,524)	(5,543,974)	(845,341)
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings	(284,000)	(188,850)	(84,850)
Payments on Miscellaneous Borrowings	(11,627)	(11,412)	(19,190)
Payments on Securitzation Facility	(200,000)	150,000	(115,000)
Payments On Long Term Notes Including Redemption Premium	(265,785)	0	0
Proceeds from Issuance of Long-Term Notes	250,000	2,750,000	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	8,281	15,365	3,270
Dividends Paid	(96,356)	(85,861)	(72,292)
Proceeds from Issuance of Common Stock	0	1,828,862	0
Issuance of Treasury Stock	9,033	5,993	2,547
Debt Issuance and Financing Fees	(15,686)	(84,248)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0	0	(2,500)
Net Cash (Used in) Provided by Financing Activities	(606,140)	4,379,849	(288,015)
Net Increase in Cash and Cash Equivalents	342,942		(72,905)
Cash and Cash Equivalents at Beginning of Period	32,794	65,607	138,512
Cash and Cash Equivalents at End of Period	$ 375,736	$ 32,794	$ 65,607