COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2015 claim	Jun. 30, 2018 USD ($) claim	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Aug. 10, 2017 claim
Commitments and Contingencies Disclosure [Abstract]
Rent expense | $		$ 5,429	$ 5,108	$ 3,901
Number of derivative actions filed	2
Number of derivative actions pending		4			6
Number of consolidated cases		2