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RELATED-PARTY TRANSACTIONS - WKY CoalPlay (Details) - WKY CoalPlay - USD ($) $ in Millions | 1 Months Ended
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Feb. 28, 2015 | Dec. 31, 2014
February 2015 coal lease - Henderson and Union Counties, Kentucky |  |
Related Party Transaction |  |
Initial term of lease | 20 years |
Percentage of earned royalty on coal sale price | 4.00% |
Annual minimum coal royalties | $ 2.1 |
December 2014 coal lease - Henderson and Union Counties, Kentucky |  |
Related Party Transaction |  |
Initial term of lease |  | 20 years
Percentage of earned royalty on coal sale price |  | 4.00%
Annual minimum coal royalties |  | $ 3.6
December 2014 coal lease - Henderson County, Kentucky |  |
Related Party Transaction |  |
Annual minimum coal royalties |  | $ 2.5

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