QUARTERLY RESULTS (UNAUDITED) - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016
Selected unaudited quarter data
General, administrative and other operating	$ 1,971	$ 3,380	$ 3,006	$ 3,966	$ 1,434	$ 3,266	$ 1,829	$ 1,877	$ 12,323	$ 8,406
Full impairment of unproved oil and gas properties	$ 11,288		2,028			$ 14,331			$ 13,316	$ 14,331
Adjustment
Selected unaudited quarter data
General, administrative and other operating			(1,300)
Full impairment of unproved oil and gas properties			$ 1,300