FAIR VALUE MEASUREMENT (Narrative) (Details) - Fair Value, Inputs, Level 3 [Member] $ in Millions	Mar. 31, 2017 USD ($)
2013 [Member]
Convertible Debt, Fair Value Disclosures	$ 14.9
2013 [Member] | Convertible Notes [Member]
Convertible Debt, Fair Value Disclosures	11.0
2016 [Member]
Convertible Debt, Fair Value Disclosures	55.0
2016 [Member] | Convertible Notes [Member]
Convertible Debt, Fair Value Disclosures	$ 111.0