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INDEBTEDNESS (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The components of indebtedness were as follows as of June 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 $(19,756)$1,353,257 
3.38% 2028 Senior Notes due on October 1, 2028
3.57 %1,000,000 (9,025)990,975 
3.63% 2031 Senior Notes due on October 1, 2031
3.77 %1,000,000 (9,975)990,025 
Total$3,373,013 $(38,756)$3,334,257 
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 June 30,Six Months Ended June 30,
2023202220232022
Coupon interest$19,289 $19,234 $38,585 $38,641 
Amortization of debt discount and issuance costs2,238 2,168 4,403 4,238 
Total$21,527 $21,402 $42,988 $42,879