FAIR VALUE MEASUREMENTS: (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017	Dec. 31, 2015
Assets and liabilities measured at fair value on a nonrecurring basis
Long-lived assets	$ (14,434)	$ (2,477)	$ (16,714)	$ (4,386)
Senior Notes | Senior Term Notes, net
Assets and liabilities measured at fair value on a nonrecurring basis
Debt fair value	125,400		125,400		$ 125,900
Debt, gross	123,000		123,000		123,000
Unamortized discount	1,439		1,439		1,815	$ 3,000
Unamortized debt issuance costs	$ 465		$ 465		$ 586