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DEBT (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Senior Subordinated Convertible Obligations The Notes are senior subordinated convertible obligations, and
interest is payable in arrears, semi-annually. The following table summarizes information regarding the Company’s convertible debt: 
December 31,
20232022
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes)
$495,000 $495,000 
Unamortized discount net of deferred offering costs(1,123)(3,040)
2024 Notes, net (1)
493,877 491,960 
1.250% senior subordinated convertible notes due in May 2027 (the 2027 Notes)
600,000 600,000 
Unamortized discount net of deferred offering costs(6,905)(8,941)
2027 Notes, net593,095 591,059 
Total convertible debt, net$1,086,972 $1,083,019 
Fair value of fixed-rate convertible debt (2):
2024 Notes$488,288 $526,230 
2027 Notes619,260 647,370 
Total fair value of fixed-rate convertible debt$1,107,548 $1,173,600 
(1)As the 2024 Notes mature in August 2024, the outstanding principal of the 2024 Notes is classified as a current liability as of December 31, 2023.
(2)The fair value of the Company’s fixed-rate convertible debt is based on open market trades and is classified as Level 1 in the fair value hierarchy. See Note 1 to these Consolidated Financial Statements for additional discussion of fair value measurements.
Schedule of Interest Expense on Fixed-Rate Convertible Debt
Interest expense on the Company’s fixed-rate convertible debt consisted of the following:
Years Ended December 31,
202320222021
Coupon interest expense$10,465 $10,465 $10,465 
Accretion of discount on convertible notes3,359 3,349 3,339 
Amortization of debt issuance costs594 593 593 
Total interest expense on convertible debt$14,418 $14,407 $14,397