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FINANCING ARRANGEMENTS (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Notes
The carrying amount of the Notes consisted of the following as of September 30, 2020 and December 31, 2019 (in thousands):
September 30, 2020December 31, 2019
Liability component:
Principal amount$250,000 $250,000 
Less: debt discount(24,307)(35,131)
Net carrying amount of liability component$225,693 $214,869 
Net carrying amount of equity component$67,014 $67,014 
Schedule of Convertible Debt Interest Expense During the three and nine months ended September 30, 2020 and 2019, we recognized interest costs on the Notes as follows (in thousands):
Three Months Ended September 30, Nine Months Ended September 30,
2020201920202019
Contractual interest (3.25% of the principal amount per annum)
$2,032 $2,032 $6,096 $6,096 
Amortization of debt discount3,701 3,341 10,824 9,772 
Total $5,733 $5,373 $16,920 $15,868