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FAIR VALUE MEASUREMENTS - NARRATIVE (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Reduction in general and administrative |  | $ 65,951 | $ 52,939 | $ 187,378 | $ 149,367
1.00% Convertible Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 1.00% |  | 1.00% |
Estimated fair value of convertible notes |  | $ 72,227 |  | $ 72,227 |
Restatement Adjustment |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Reduction in general and administrative | $ (7,012) |  |  |  |
Performance Period, One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Performance Measurement Period | 12 months |  |  |  |
Performance Period, Two |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Performance Measurement Period | 24 months |  |  |  |

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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