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FAIR VALUE MEASUREMENT (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Jul. 24, 2017 | Jun. 24, 2017 | Dec. 02, 2016
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Four Point Five Percentage Convertible Notes [Member] |  |  |  |
Debt Instrument, Face Amount |  | $ 9.0 | $ 9.0 |
Seven Point Five Percentage Convertible Notes [Member] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 10.0 | $ 22.5
Seven Point Five Percentage Convertible Notes 2016 [Member] |  |  |  |
Debt Instrument, Face Amount |  | $ 10.0 |  |
Fair Value, Inputs, Level 3 [Member] | Four Point Five Percentage Convertible Notes [Member] |  |  |  |
Convertible Debt, Fair Value Disclosures | $ 5.7 |  |  |
Fair Value, Inputs, Level 3 [Member] | Seven Point Five Percentage Convertible Notes [Member] |  |  |  |
Convertible Debt, Fair Value Disclosures | 76.6 |  |  |
Fair Value, Inputs, Level 3 [Member] | Four Point Five Percentage Convertible Notes 2013 [Member] |  |  |  |
Debt Instrument, Face Amount | 5.9 |  |  |
Fair Value, Inputs, Level 3 [Member] | Seven Point Five Percentage Convertible Notes 2016 [Member] |  |  |  |
Debt Instrument, Face Amount | $ 59.1 |  |  |

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