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DEBT - Components of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Total carrying amount $ 349,471 $ 366,984
Current Portion 71,210 71,491
Non-Current Portion 278,261 295,493
2019 Notes    
Debt Instrument [Line Items]    
Discount and debt issuance costs 4,200 4,500
2019 Notes | Convertible Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 225,761 225,534
Term Loan    
Debt Instrument [Line Items]    
Long-term debt, gross 122,500 140,000
Other    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,210 $ 1,450