Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND OTHER INFORMATION (Impact of Adoption of Accounting Standard) (Details)

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BASIS OF PRESENTATION AND OTHER INFORMATION (Impact of Adoption of Accounting Standard) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated deficit $ (3,317,397) $ (3,327,737)    
Total equity (145,617) (188,454) $ (394,114) $ (133,752)
Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total equity   (35,464)    
Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total equity (3,317,397) (3,327,737) (2,984,026) (2,676,833)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total equity   60,522    
Additional Paid-in Capital        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total equity $ 2,888,551 2,897,695 $ 2,431,387 $ 2,386,790
Additional Paid-in Capital | Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total equity   (95,986)    
Accounting Standards Update 2020-06        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Convertible Debt, Current   14,700    
Convertible Debt, Noncurrent   $ 20,800