Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and Cash Equivalents	$ 25,058	$ 21,878
Accounts and Notes Receivable:
Trade	408,350	428,328
Notes, Loans and Financing Receivable, Net, Current	322,406	318,387
Other Receivables	153,697	131,131
Accounts Receivable - Securitized	30,119	37,846
Inventories	217,034	247,766
Deferred Income Taxes	160,750	148,104
Recoverable Income Taxes	6,602	0
Restricted Cash and Cash Equivalents, Current	0	48,294
Prepaid Expenses	115,156	157,360
Total Current Assets	1,439,172	1,539,094
Property, Plant and Equipment:
Property, Plant and Equipment	15,749,523	15,545,204
Less-Accumulated Depreciation, Depletion and Amortization	5,516,319	5,354,237
Total Property, Plant and Equipment-Net	10,233,204	10,190,967
Other Assets:
Deferred Income Taxes	425,079	444,585
Restricted Cash	20,383	20,379
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	248,127	222,830
Notes, Loans and Financing Receivable, Net, Noncurrent	25,995	25,977
Other	201,234	227,077
Total Other Assets	920,818	940,848
Total Assets	12,593,194	12,670,909
Current Liabilities:
Accounts Payable	463,886	507,982
Current Portion of Long-Term Debt	13,353	13,485
Short-Term Notes Payable	0	25,073
Accrued Income Taxes, Current	0	34,219
Secured Debt, Current	30,119	37,846
Other Accrued Liabilities	839,294	768,494
Total Current Liabilities	1,346,652	1,387,099
Long-Term Debt:
Long-Term Debt	3,124,240	3,124,473
Capital Lease Obligations	48,299	50,113
Total Long-Term Debt	3,172,539	3,174,586
Deferred Credits and Other Liabilities
Postretirement Benefits Other Than Pensions	2,825,925	2,832,401
Pneumoconiosis Benefits	175,952	174,781
Mine Closing	449,891	446,727
Gas Well Closing	150,973	148,928
Workers' Compensation	154,573	155,648
Salary Retirement	172,306	218,004
Reclamation	43,833	47,965
Other	128,316	131,025
Total Deferred Credits and Other Liabilities	4,101,769	4,155,479
TOTAL LIABILITIES	8,620,960	8,717,164
Stockholders' Equity:
Common Stock, $.01 Par Value; 500,000,000 Shares Authorized, 228,609,116 Issued and 228,574,361 Outstanding at March 31, 2013; 228,129,467 Issued and 228,094,712 Outstanding at December 31, 2012	2,289	2,284
Capital in Excess of Par Value	2,320,223	2,296,908
Preferred Stock, 15,000,000 shares authorized, None issued and outstanding	0	0
Retained Earnings	2,393,528	2,402,551
Accumulated Other Comprehensive Loss	(742,893)	(747,342)
Common Stock in Treasury, at Cost—34,755 Shares at March 31, 2013 and 34,755 Shares at December 31, 2012	(609)	(609)
Stockholders' Equity Attributable to Parent	3,972,538	3,953,792
Stockholders' Equity Attributable to Noncontrolling Interest	(304)	(47)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,972,234	3,953,745
TOTAL LIABILITIES AND EQUITY	$ 12,593,194	$ 12,670,909