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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
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)