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DEBT (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Summary of Convertible Debt The following table summarizes information regarding the Company’s convertible debt:
March 31,
2022		December 31,
2021
1.25% senior subordinated convertible notes due in May 2027 (the 2027 Notes)
$600,000 $600,000 
Unamortized discount net of deferred offering costs(10,465)(10,971)
2027 Notes, net589,535 589,029 
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes)
495,000 495,000 
Unamortized discount net of deferred offering costs(4,474)(4,952)
2024 Notes, net490,526 490,048 
Total convertible debt, net$1,080,061 $1,079,077 
Fair value of fixed-rate convertible debt (1):
2027 Notes
$604,758 $625,122 
2024 Notes
497,223 521,082 
Total fair value of fixed-rate convertible debt$1,101,981 $1,146,204 
(1)    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. For additional discussion of fair value measurements, see Note 1 – Business Overview and Significant Accounting Policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021.
Summary of Interest Expense on Debt
Interest expense on the Company’s convertible debt consisted of the following: 
Three Months Ended March 31,
20222021
Coupon interest expense$2,616 $2,616 
Accretion of discount on convertible notes836 834 
Amortization of debt issuance costs148 148 
Total interest expense on convertible debt$3,600 $3,598