DEBT - INTEREST EXPENSE COMPONENTS (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 18, 2013
Debt Instrument [Line Items]
Non-cash amortization of discount on Convertible Notes	$ 5,237	$ 6,098
Amortization of debt issuance costs	$ 188	381
1.00% Convertible Notes due 2018
Debt Instrument [Line Items]
Interest rate	1.00%
Convertible Debt \| 1.00% Convertible Notes due 2018
Debt Instrument [Line Items]
Interest rate			1.00%
Cash interest expense (coupon interest expense)	$ 448	719
Non-cash amortization of discount on Convertible Notes	5,237	3,135
Amortization of debt issuance costs	160	107
Total interest expense related to Convertible Notes	$ 5,845	$ 3,961

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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