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Mine Closing, Reclamation, and Gas Well Closing (Tables)
 12 Months Ended
Dec. 31, 2014
MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
 
 
As of December 31,
 
 
2014
 
2013
Balance at beginning of period
 
$
600,875

 
$
539,177

Accretion expense
 
42,608

 
41,909

Payments
 
(52,339
)
 
(38,198
)
Revisions in estimated cash flows
 
(2,069
)
 
42,558

Other
 
(13,546
)
 
15,429

Balance at end of period
 
$
575,529

 
$
600,875