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Mine Closing, Reclamation, and Gas Well Closing (Tables)
 12 Months Ended
Dec. 31, 2011
MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
 
 
As of December 31,
 
 
2011
 
2010
Balance at beginning of period
 
$
670,856

 
$
533,177

Accretion expense
 
48,120

 
46,200

Payments
 
(57,584
)
 
(45,961
)
Revisions in estimated cash flows
 
(4,621
)
 
82,742

Dominion Acquisition (Note 2)
 
—

 
62,098

Disposition
 
(6,698
)
 
(7,400
)
Balance at end of period
 
$
650,073

 
$
670,856