INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2017

Equity Investments

Schedule of changes in cost method investment

	Year Ended December 31,
	2017
	(in thousands)
Beginning balance	$	—
Contributions		100,000
Payment-in-kind distributions received		6,398
Ending balance	$	106,398

AllDale Minerals

Equity Investments

Schedule of changes in the ARLP Partnership's equity investment

	Year Ended December 31,
	2017		2016		2015
	(in thousands)
Beginning balance	$	138,817	$	64,509	$	11,257
Contributions		20,688		76,797		54,290
Equity investment income (loss)		13,860		3,543		(594)
Distributions received		(25,401)		(6,032)		(444)
Ending balance	$	147,964	$	138,817	$	64,509

White Oak

Equity Investments

Summary of White Oak's results prior to the Hamilton Acquisition

	January 1, 2015
	to July 31, 2015
	(in thousands)
Total revenues	$	108,256
Gross loss		(2,919)
Loss from operations		(38,148)
Net loss		(69,075)