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Asset Impairments (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Net book value and fair values of the assets        
Coal and other mineral rights, net book value $ 1,257,501,000   $ 1,257,501,000 $ 1,281,636,000
Intangible assets, net book value 75,164,000   75,164,000 161,931,000
Plant and equipment, net book value 46,185,000   46,185,000 62,348,000
Asset Impairment (Textual) [Abstract]        
Non-recoupable minimum royalty balance     24,100,000  
Asset impairment charges 70,400,000 90,900,000 161,336,000  
Gatling LLC West Verginia [Member]
        
Net book value and fair values of the assets        
Coal and other mineral rights, net fair value 6,618,000   6,618,000  
Intangible assets, net fair value 0   0  
Plant and equipment, net fair value 2,600,000   2,600,000  
Total, net fair value 9,218,000   9,218,000  
Coal and other mineral rights, net book value 76,003,000   76,003,000  
Intangible assets, net book value 43,855,000   43,855,000  
Plant and equipment, net book value 7,775,000   7,775,000  
Total, net book value 127,633,000   127,633,000  
Asset Impairment (Textual) [Abstract]        
Non-recoupable minimum royalty balance     24,100,000  
Non-recoupable minimum royalty payments     3,400,000  
Net impairment     90,900,000  
Asset impairment charges     118,400,000  
Gatling LLC Ohio [Member]
        
Net book value and fair values of the assets        
Coal and other mineral rights, net fair value 20,035,000   20,035,000  
Intangible assets, net fair value 0   0  
Plant and equipment, net fair value 2,947,000   2,947,000  
Total, net fair value 22,982,000   22,982,000  
Coal and other mineral rights, net book value 56,769,000   56,769,000  
Intangible assets, net book value 33,670,000   33,670,000  
Plant and equipment, net book value 2,947,000   2,947,000  
Total, net book value 93,386,000   93,386,000  
Asset Impairment (Textual) [Abstract]        
Recoupable minimum royalty balance     9,600,000  
Asset impairment charges     $ 70,400,000