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DEBT (Tables)
 9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Carrying value, interest expense, and effective interest rate for the notes
Carrying value of the Notes:
(in thousands)September 30, 2022December 31, 2021
Principal$600,000 $600,000 
Unamortized issuance costs(7,116)(9,278)
Convertible senior notes, net$592,884 $590,722 

Interest expense related to the Notes:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2022202120222021
Contractual interest expense (0.75% coupon)
$1,125 $1,125 $3,375 $3,375 
Amortization of issuance costs
724 677 2,163 2,025 
$1,849 $1,802 $5,538 $5,400 
The effective interest rate for the Notes:
Nine Months Ended
September 30,
20222021
Weighted-average effective interest rate1.2 %1.2 %
Schedule of future payments of principal and contractual interest Future payments of principal and contractual interest:
September 30, 2022
(in thousands)PrincipalInterestTotal
2023$— $4,500 $4,500 
2024— 4,500 4,500 
2025600,000 2,250 602,250 
$600,000 $11,250 $611,250 
Schedule of change in capped call transactions Change in capped call transactions:
Nine Months Ended
September 30,
(in thousands)20222021
January 1,$59,964 $83,597 
Fair value adjustment(56,381)(7,543)
September 30,$3,583 $76,054