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INDEBTEDNESS
 9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
INDEBTEDNESS INDEBTEDNESS
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 
Convertible Senior Notes
In May 2021, the Company issued an aggregate principal amount of $1.44 billion of convertible senior notes due in 2026 (the “2026 Convertible Notes”) pursuant to an indenture, dated May 18, 2021 (the “Convertible Notes Indenture”), between the Company and U.S. Bank National Association, as trustee. The 2026 Convertible Notes were offered and sold in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”).
Senior Notes
In September 2021, the Company completed the issuance of an aggregate principal amount of $1.0 billion of senior notes due on October 1, 2028 (the “2028 Senior Notes”) and an aggregate principal amount of $1.0 billion of senior notes due on October 1, 2031 (the “2031 Senior Notes” and together with the 2028 Senior Notes, the “Senior Notes”). The Senior Notes were issued within the United States only to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act, and outside the United States to non-U.S. persons pursuant to Regulation S under the Securities Act.
The indenture governing the Senior Notes contains customary covenants that restrict the ability of the Company and certain of its subsidiaries to incur debt and liens. The Company is not aware of any instances of non-compliance with the covenants as of September 30, 2022.
Interest
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 
Debt discounts and debt issuance costs are amortized to interest expense using the effective interest method over the contractual term of the respective note.