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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended	0 Months Ended	27 Months Ended	0 Months Ended
	Dec. 31, 2013	Sep. 22, 2011 White Oak	Dec. 31, 2013 White Oak	Sep. 22, 2011 White Oak Minimum	Sep. 22, 2011 White Oak Maximum
COMMITMENTS AND CONTINGENCIES
Contractual commitments amount	$ 66.2
Estimated cost of commitments to purchase coal	0
Contractual Commitments
Amount funded by partnership		69.5	216.7
Total expected funding by partnership				$ 300.5	$ 425.5

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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