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FINANCING ARRANGEMENTS - Schedule of Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal amount $ 250,000 $ 250,000
Less: debt discount (57,381) (60,247)
Net carrying amount of liability component 192,619 $ 189,753
Additional Paid-In Capital    
Debt Instrument [Line Items]    
Net carrying amount of equity component $ 67,014