Mine Closing, Reclamation, and Gas Well Closing (Tables)

12 Months Ended

Dec. 31, 2013

MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	As of December 31,
	2013			2012
Balance at beginning of period	$	539,177		$	500,648
Accretion expense	41,909			37,922
Payments	(38,198		)	(36,086		)
Revisions in estimated cash flows	42,558			40,832
Other	15,429			(4,139		)
Balance at end of period	$	600,875		$	539,177