FINANCING ARRANGEMENTS - Senior Term Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Senior Term Notes, net	$ 119,855	$ 119,606
Senior term notes | Senior Term Notes 5.50%
Debt Instrument [Line Items]
Principal amount on the Senior Term Notes	123,000	123,000
Unamortized debt discount	(2,377)	(2,565)	$ (3,000)
Unamortized debt issuance costs	(768)	(829)
Senior Term Notes, net	$ 119,855	$ 119,606