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DEBT (Tables) | 3 Months Ended
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Mar. 31, 2021
Debt Disclosure [Abstract] |
Contractual obligation, fiscal year maturity schedule | Carrying value of the Notes:
(in thousands) | March 31, 2021 |  | December 31, 2020
Principal | $ | 600,000 |  |  | $ | 600,000 |
Unamortized debt discount | — |  |  | (71,222) |
Unamortized issuance costs | (11,582) |  |  | (10,575) |
Convertible senior notes, net | $ | 588,418 |  |  | $ | 518,203 |
Conversion options | $ | — |  |  | $ | 84,120 |
Issuance costs | — |  |  | (2,037) |
Deferred taxes | — |  |  | (20,479) |
Additional paid-in capital | $ | — |  |  | $ | 61,604 |
Interest expense related to the Notes:
|  |  | Three Months Ended March 31,
(in thousands) |  |  |  |  | 2021 |  | 2020
Contractual interest expense (0.75% coupon) |  |  |  |  | $ | 1,125 |  |  | $ | 450 |
Amortization of debt discount |  |  |  |  | — |  |  | 1,497 |
Amortization of issuance costs |  |  |  |  | 673 |  |  | 222 |
|  |  |  |  | $ | 1,798 |  |  | $ | 2,169 |
Weighted-average effective interest rate |  |  |  |  | 1.2 | % |  | 4.3 | %
Future payments of principal and contractual interest:
| March 31, 2021
(in thousands) | Principal |  | Interest |  | Total
2021 | $ | — |  |  | $ | 2,250 |  |  | $ | 2,250 |
2022 | — |  |  | 4,500 |  |  | 4,500 |
2023 | — |  |  | 4,500 |  |  | 4,500 |
2024 | — |  |  | 4,500 |  |  | 4,500 |
2025 | 600,000 |  |  | 1,488 |  |  | 601,488 |
| $ | 600,000 |  |  | $ | 17,238 |  |  | $ | 617,238 |
Schedule of derivative instruments | Change in capped call transactions:
| Three Months Ended March 31,
(in thousands) | 2021 |  | 2020
January 1, | $ | 83,597 |  |  | $ | — |
Issuance | — |  |  | 51,900 |
Fair value adjustment | (19,117) |  |  | (18,592) |
March 31, | $ | 64,480 |  |  | $ | 33,308 |

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579240-113959 + Details
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