DEFERRED REVENUE (Tables)

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

Rollforward of deferred revenue

A rollforward of current deferred revenue follows.

	Utica Shale		Williston Basin		DJ Basin		Piceance Basin		Barnett Shale		Marcellus Shale		Total current
	(In thousands)
Current deferred revenue,     January 1, 2019	$	18	$	1,414	$	739	$	7,616	$	1,642	$	38	$	11,467
Additions		5		350		393		5,222		409		9		6,388
Less revenue recognized		5		364		211		5,222		405		9		6,216
Current deferred revenue,     March 31, 2019	$	18	$	1,400	$	921	$	7,616	$	1,646	$	38	$	11,639

A rollforward of noncurrent deferred revenue follows.

	Utica Shale		Williston Basin		DJ Basin		Piceance Basin		Barnett Shale		Marcellus Shale		Total noncurrent
	(In thousands)
Noncurrent deferred revenue,     January 1, 2019	$	21	$	4,393	$	7,284	$	17,942	$	9,628	$	236	$	39,504
Additions		—		1,701		1,335		1,785		378		—		5,199
Less reclassification to current     deferred revenue		5		787		393		1,897		409		9		3,500
Noncurrent deferred revenue,     March 31, 2019	$	16	$	5,307	$	8,226	$	17,830	$	9,597	$	227	$	41,203