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DEBT (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Summary of Convertible Debt The following table summarizes information regarding the Company’s convertible debt: 
September 30,
2020		December 31,
2019
1.25% senior subordinated convertible notes due in May 2027 (the 2027 Notes)
$600,000 $— 
Unamortized discount(12,792)— 
Unamortized deferred offering costs(709)— 
2027 Notes, net586,499 — 
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes)
495,000 495,000 
Unamortized discount(5,470)(6,533)
Unamortized deferred offering costs(1,865)(2,229)
2024 Notes, net487,665 486,238 
1.50% senior subordinated convertible notes due in October 2020 (the 2020 Notes)
374,993 374,993 
Unamortized discount(649)(12,078)
Unamortized deferred offering costs(54)(1,033)
2020 Notes, net (1)
374,290 361,882 
Total convertible debt, net$1,448,454 $848,120 
Fair value of fixed rate convertible debt (2):
2027 Notes
$590,010 $— 
2024 Notes
517,730 521,839 
2020 Notes
374,997 405,679 
Total fair value of fixed rate convertible debt$1,482,737 $927,518 
(1)    The 2020 Notes are classified as a current liability in the periods presented because they matured on October 15, 2020 and were settled in cash for approximately $375.0 million. No shares were issued in connection with the settlement as the Company’s share price did not exceed the conversion price of $94.15, as measured over a 25-day averaging period, and the capped call transaction entered into concurrently with the issuance of notes was not triggered. The Company incurred no gain or loss upon the extinguishment of the 2020 Notes.
(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. For additional discussion of fair value measurements, see Note 3 – Summary of Significant Accounting Policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.
Summary of Interest Expense on Debt
Interest expense on the Company’s convertible debt consisted of the following: 
Three Months Ended
September 30,		Nine Months Ended
September 30,
2020201920202019
Accretion of discount on convertible notes$4,696 $4,005 $13,201 $11,860 
Coupon interest expense4,255 2,271 9,443 6,681 
Amortization of debt issuance costs535 508 1,565 1,522 
Total interest expense on convertible debt$9,486 $6,784 $24,209 $20,063