Accrued Expenses And Other Current Liabilities (Accrued Expenses And Other Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Expenses And Other Current Liabilities [Abstract]
Payroll and employee benefits	$ 65,323	$ 51,327
Taxes other than income taxes	133,331	107,969
Interest	55,266	52,843
Coal Supply Agreement Liability	38,441	5,615
Workers' compensation	11,666	6,659
Asset retirement obligations	27,119	8,862
Other	17,061	12,136
Accrued expenses and other current liabilities, total	$ 348,207	$ 245,411