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INDEBTEDNESS (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The components of indebtedness were as follows as of September 30, 2023 (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 %$1,373,013 $(18,134)$1,354,879 
3.38% 2028 Senior Notes due on October 1, 2028
3.57 %1,000,000 (8,623)991,377 
3.63% 2031 Senior Notes due on October 1, 2031
3.77 %737,457 (7,114)730,343 
Total$3,110,470 $(33,871)$3,076,599 
The components of indebtedness were as follows as of December 31, 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 $(23,339)$1,414,161 
3.38% 2028 Senior Notes due on October 1, 2028
3.57 %1,000,000 (10,022)989,978 
3.63% 2031 Senior Notes due on October 1, 2031
3.77 %1,000,000 (10,691)989,309 
Total$3,437,500 $(44,052)$3,393,448 
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,
2023202220232022
Coupon interest$18,510 $19,296 $57,095 $57,937 
Amortization of debt discount and issuance costs2,262 2,204 6,665 6,442 
Total$20,772 $21,500 $63,760 $64,379