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FINANCING ARRANGEMENTS - Schedule of Notes (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Apr. 04, 2016
Debt Instrument [Line Items]      
Convertible Debt, Fair Value Disclosures $ 262,700 $ 257,100  
Principal amount 250,000 250,000  
Less: debt discount (35,131) (48,331) $ (4,800)
Net carrying amount of liability component 214,869 201,669  
Additional Paid-In Capital      
Debt Instrument [Line Items]      
Net carrying amount of equity component $ 67,014 $ 67,014