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DEBT (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Summary of Convertible Debt | The following table summarizes information regarding the Company’s convertible debt:
| June 30, 2021 |  | December 31, 2020
1.25% senior subordinated convertible notes due in May 2027 (the 2027 Notes) | $ | 600,000 |  |  | $ | 600,000 |
Unamortized discount net of deferred offering costs | (11,984) |  |  | (12,995) |
2027 Notes, net | 588,016 |  |  | 587,005 |
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes) | 495,000 |  |  | 495,000 |
Unamortized discount net of deferred offering costs | (5,906) |  |  | (6,860) |
2024 Notes, net | 489,094 |  |  | 488,140 |
Total convertible debt, net | $ | 1,077,110 |  |  | $ | 1,075,145 |
Fair value of fixed rate convertible debt (1): |  |  |
2027 Notes | $ | 604,026 |  |  | $ | 627,090 |
2024 Notes | 515,745 |  |  | 530,714 |
Total fair value of fixed rate convertible debt | $ | 1,119,771 |  |  | $ | 1,157,804 |
(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 3 – Summary of Significant Accounting Policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020.
Summary of Interest Expense on Debt | Interest expense on the Company’s convertible debt consisted of the following:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Coupon interest expense | $ | 2,616 |  |  | $ | 3,016 |  |  | $ | 5,232 |  |  | $ | 5,188 |
Accretion of discount on convertible notes | 834 |  |  | 4,395 |  |  | 1,668 |  |  | 8,505 |
Amortization of debt issuance costs | 148 |  |  | 522 |  |  | 296 |  |  | 1,030 |
Total interest expense on convertible debt | $ | 3,598 |  |  | $ | 7,933 |  |  | $ | 7,196 |  |  | $ | 14,723 |

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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