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INDEBTEDNESS (Tables)
 9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt Instruments
The components of indebtedness were as follows as of September 30, 2022 (in thousands, except percentages):
IndebtednessEffective Interest RatePrincipal AmountUnamortized Debt Discount and Issuance CostsNet Carrying Amount
0.50% 2026 Convertible Notes due on June 1, 2026
0.98 %$1,437,500 $(24,903)$1,412,597 
3.38% 2028 Senior Notes due on October 1, 2028
3.57 %1,000,000 (10,413)989,587 
3.63% 2031 Senior Notes due on October 1, 2031
3.77 %1,000,000 (10,947)989,053 
Total$3,437,500 $(46,263)$3,391,237 
The components of indebtedness were as follows as of December 31, 2021 (in thousands, except percentages):
IndebtednessEffective Interest RatePrincipal AmountUnamortized Debt Discount and Issuance CostsNet Carrying Amount
0.50% 2026 Convertible Notes due on June 1, 2026
0.98 %$1,437,500 $(29,436)$1,408,064 
3.38% 2028 Senior Notes due on October 1, 2028
3.57 %1,000,000 (11,565)988,435 
3.63% 2031 Senior Notes due on October 1, 2031
3.77 %1,000,000 (11,704)988,296 
Total$3,437,500 $(52,705)$3,384,795 
Interest Expense Disclosure
The following table summarizes the interest expense for the 2026 Convertible Notes, the 2028 Senior Notes and the 2031 Senior Notes (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Coupon interest$19,296 $5,300 $57,937 $5,300 
Amortization of debt discount and issuance costs2,204 1,672 6,442 2,420 
Total$21,500 $6,972 $64,379 $7,720