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FINANCING ARRANGEMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Notes
The carrying amount of the Notes consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):
June 30, 2020December 31, 2019
Liability component:
Principal amount$250,000  $250,000  
Less: debt discount(28,008) (35,131) 
Net carrying amount of liability component$221,992  $214,869  
Net carrying amount of equity component$67,014  $67,014  
Schedule of Convertible Debt Interest Expense During the three and six months ended June 30, 2020 and 2019, we recognized interest costs on the Notes as follows (in thousands):
Three Months Ended June 30, Six Months Ended June 30,
2020201920202019
Contractual interest (3.25% of the principal amount per annum)
$2,032  $2,032  $4,064  $4,064  
Amortization of debt discount3,607  3,256  7,123  6,431  
Total $5,639  $5,288  $11,187  $10,495