Discontinued Operations Balance Sheet (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Inventory	$ 0	$ 76,958,000
Disposal Group, Including Discontinued Operation, Deferred Tax Assets, Noncurrent	0	771,270,000
Disposal Group, Including Discontinued Operation, Deferred Tax Assets	0	63,327,000
Disposal Group, Including Discontinued Operation, Other Current Assets	0	8,945,000
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net	0	1,682,909,000
Disposal Group, Including Discontinued Operation, Other Noncurrent Assets	0	10,842,000
Assets of Disposal Group, Including Discontinued Operation	0	2,614,251,000
Liabilities of Disposal Group, Including Discontinued Operation, Current	28,239,000	233,214,000
Disposal Group, Discontinued Operations, Long-Term Debt	0	1,573,000
Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation	0	1,949,801,000
Disposal Group, Discontinued Operations, Pneumoconiosis Benefits	0	60,645,000
Disposal Group, Discontinued Operations, Workers' Compensation	0	95,252,000
Disposal Group, including discontinued operations, Mine Closing	0	156,909,000
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	2,278,251,000
Disposal Group, Including Discontinued Operation, Other Liabilities		15,644,000
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	$ 28,239,000	$ 2,513,038,000