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FINANCIAL INSTRUMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 23, 2013 | Jun. 30, 2017 | Mar. 13, 2017 | Mar. 07, 2017
Fair Value Measurements |  |  |  |
Closing sale price (in dollars per share) |  | $ 47.7 |  |
Debt Instrument, Convertible, Conversion Premium, Shares |  | 0.1 |  |
Estimated conversion value |  | $ 300 |  |
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 |  | 368,072 |  |
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 |  | $ 269,238 |  |
Convertible Senior Notes Due 2019 |  |  |  |
Fair Value Measurements |  |  |  |
Initial conversion price of notes into common stock (in dollars per share) | $ 24.82 | $ 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 |  | 654 |  |
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 |  | $ 319 |  |
Maximum | Convertible Senior Notes Due 2022 |  |  |  |
Fair Value Measurements |  |  |  |
Debt Instrument, Convertible, Conversion Premium, Shares | 5.2 |  |  |
Maximum | Convertible Senior Notes Due 2019 |  |  |  |
Fair Value Measurements |  |  |  |
Debt Instrument, Convertible, Conversion Premium, Shares | 0.1 |  |  |

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