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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Values Of Financial Assets And Liabilities Not Measured At Fair Value (details) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of financial liabilities [line items] |  |
Total liabilities | $ (1,305,083) | $ (616,153)
Non-recurring fair value measurement |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | (387,582) | (284,049)
Non-recurring fair value measurement | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | (539,481) | (414,316)
Level 3 | Non-recurring fair value measurement | Term loan |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | (210,000) | 0
Level 3 | Non-recurring fair value measurement | Term loan | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | (221,943) | 0
2013 Notes | Level 1 | Non-recurring fair value measurement | Convertible notes |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | 0 | (114,280)
2013 Notes | Level 1 | Non-recurring fair value measurement | Convertible notes | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | 0 | (116,581)
2019 Notes | Level 1 | Non-recurring fair value measurement | Convertible notes |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | (177,582) | (169,769)
2019 Notes | Level 1 | Non-recurring fair value measurement | Convertible notes | Fair value |  |
Disclosure of financial liabilities [line items] |  |
Total liabilities | $ (317,538) | $ (297,735)

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