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DEBT (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Debt
The following table provides information regarding the Company’s debt.
March 31,
2022		December 31,
2021
(In thousands)
Convertible notes
Notes due 2028$575,000 $575,000 
Less: unamortized debt discount— (143,636)
Less: unamortized debt issuance costs(7,684)(5,775)
Carrying amount of Notes due 2028 (1)
567,316 425,589 
Notes due 2026632,500 632,500 
Less: unamortized debt discount— (104,755)
Less: unamortized debt issuance costs(7,813)(6,678)
Carrying amount of Notes due 2026 (1)
624,687 521,067 
Notes due 2025102,175 102,175 
Less: unamortized debt discount(13,535)(14,584)
Less: unamortized debt issuance costs(1,421)(1,539)
Carrying amount of Notes due 202587,219 86,052 
Notes due 20235,000 5,000 
Less: unamortized issuance costs(53)(62)
Carrying amount of Notes due 20234,947 4,938 
Total carrying amount of debt1,284,169 1,037,646 
Less: current portion of convertible notes(87,219)(86,052)
Debt, non-current$1,196,950 $951,594 
(1)    The net carrying amount was increased on January 1, 2022 as a result of the adoption of ASU 2020-06. Refer to Note 2, Summary of Significant Accounting Policies, in this Quarterly Report on Form 10-Q for further information.
The following table presents the total amount of interest cost recognized in the statement of operations relating to the Notes due 2028:
Three Months Ended
March 31,
20222021
(In thousands)
Amortization of debt discount$— $1,611 
Amortization of debt issuance costs316 79 
Total interest cost recognized$316 $1,690 
The following table presents the total amount of interest cost recognized in the statement of operations relating to the Notes due 2026:
Three Months Ended
March 31,
20222021
(In thousands)
Amortization of debt discount$— $1,786 
Amortization of debt issuance costs485 135 
Total interest cost recognized$485 $1,921 
The following table presents the total amount of interest cost recognized relating to the Notes due 2025:

Three Months Ended
March 31,
20222021
(In thousands)
Contractual interest expense$64 $150 
Amortization of debt discount1,049 2,389 
Amortization of debt issuance costs118 294 
Total interest cost recognized$1,231 $2,833 
The following table presents the amount of interest cost recognized relating to the contractual interest coupon and the amortization of debt issuance costs of the Notes due 2023.
Three Months Ended
March 31,
20222021
(In thousands)
Contractual interest expense$50 $50 
Amortization of debt issuance costs10 10 
Total interest costs recognized$60 $60