RELATED-PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2017

RELATED-PARTY TRANSACTIONS

Summary of advanced royalties outstanding

				WKY CoalPlay
				Towhead		Webster		Henderson		WKY
		SGP		Coal		Coal		Coal		CoalPlay
				Henderson						Henderson
		Tunnel		& Union		Webster		Henderson		& Union
		Ridge		Counties, KY		County, KY		County, KY		Counties, KY		Total
		Acquired		Acquired		Acquired		Acquired		Acquired
		2005		December 2014		December 2014		December 2014		February 2015
	(in thousands)
As of January 1, 2015		$	10,706	$	—	$	—	$	—	$	—	$	10,706
Payments			3,000		3,598		2,568		2,522		2,131		13,819
Recoupment			(8,293)		—		(42)		—		—		(8,335)
As of December 31, 2015			5,413		3,598		2,526		2,522		2,131		16,190
Payments			3,000		3,598		2,568		2,522		2,131		13,819
Recoupment			(8,413)		(1)		(1,775)		—		—		(10,189)
As of December 31, 2016			—		7,195		3,319		5,044		4,262		19,820
Payments			6,000		3,598		2,568		2,522		2,131		16,819
Recoupment			(3,000)		(109)		(531)		—		(6)		(3,646)
As of December 31, 2017		$	3,000	$	10,684	$	5,356	$	7,566	$	6,387	$	32,993