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DEBT - Long-term debt (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Mar. 01, 2021
Debt Instrument [Line Items]      
Total carrying amount of debt $ 1,291,612,000 $ 1,290,357,000  
Less: debt, current (94,665,000) (90,892,000)  
Debt, non-current 1,196,947,000 1,199,465,000  
Convertible Notes | Notes due 2028      
Debt Instrument [Line Items]      
Long-term debt, gross 575,000,000 575,000,000  
Less: unamortized debt issuance costs (5,735,000) (6,705,000) $ (5,700,000)
Total carrying amount of debt 569,265,000 568,295,000  
Convertible Notes | Notes due 2026      
Debt Instrument [Line Items]      
Long-term debt, gross 632,500,000 632,500,000  
Less: unamortized debt issuance costs (4,818,000) (6,307,000)  
Total carrying amount of debt 627,682,000 626,193,000  
Convertible Notes | Notes due 2025      
Debt Instrument [Line Items]      
Long-term debt, gross 102,175,000 102,175,000  
Less: unamortized debt discount (6,819,000) (10,229,000)  
Less: unamortized debt issuance costs (691,000) (1,054,000)  
Total carrying amount of debt 94,665,000 90,892,000  
Less: debt, current (102,200,000)    
Convertible Notes | Notes due 2023      
Debt Instrument [Line Items]      
Long-term debt, gross 0 5,000,000  
Less: unamortized debt issuance costs 0 (23,000)  
Total carrying amount of debt $ 0 $ 4,977,000