FINANCING ARRANGEMENTS - Schedule of Senior Term Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount on the Senior Term Notes	$ 123,000
Unamortized debt discount	(1,800)
Unamortized debt issuance costs	(600)
Senior Term Notes, net	120,599	$ 119,606
Senior Notes | Senior Term Notes, net
Debt Instrument [Line Items]
Principal amount on the Senior Term Notes	123,000	123,000
Unamortized debt discount	(1,815)	(2,565)	$ (3,000)
Unamortized debt issuance costs	(586)	(829)
Senior Term Notes, net	$ 120,599	$ 119,606