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FINANCIAL INSTRUMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Jan. 23, 2013	Jun. 30, 2018	Mar. 13, 2017	Mar. 07, 2017
Fair Value Measurements
Closing sale price (in dollars per share)		$ 32.05
Debt Instrument, Convertible, Conversion Premium, Shares		0.0
Estimated conversion value		$ 100
Convertible Senior Notes Due 2022
Fair Value Measurements
Closing sale price (in dollars per share)				$ 48.65
Initial conversion price of notes into common stock (in dollars per share)	$ 66.89		$ 66.89
Convertible Senior Notes Due 2022 | Level 1
Fair Value Measurements
Convertible senior notes		0
Convertible Senior Notes Due 2022 | Level 2
Fair Value Measurements
Convertible senior notes		322,351
Convertible Senior Notes Due 2022 | Level 3
Fair Value Measurements
Convertible senior notes		0
Convertible Senior Notes Due 2022 | Carrying Value
Fair Value Measurements
Convertible senior notes		283,258
Convertible Senior Notes Due 2019
Fair Value Measurements
Initial conversion price of notes into common stock (in dollars per share)	$ 24.82
Convertible Senior Notes Due 2019 | Level 1
Fair Value Measurements
Convertible senior notes		0
Convertible Senior Notes Due 2019 | Level 2
Fair Value Measurements
Convertible senior notes		446
Convertible Senior Notes Due 2019 | Level 3
Fair Value Measurements
Convertible senior notes		0
Convertible Senior Notes Due 2019 | Carrying Value
Fair Value Measurements
Convertible senior notes		$ 330
Maximum [Member] | Convertible Senior Notes Due 2022
Fair Value Measurements
Debt Instrument, Convertible, Conversion Premium, Shares	5.2
Maximum [Member] | Convertible Senior Notes Due 2019
Fair Value Measurements
Debt Instrument, Convertible, Conversion Premium, Shares	0.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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