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DEBT (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt |
Schedule of debt | Our debt consists of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(In thousands) |  | 2020 |  | 2019
2023 Notes | ​ | $ | 240,984 | ​ | $ | 240,984
2025 Notes | ​ | ​ | 192,500 | ​ | ​ | 192,500
Total debt | ​ | ​ | 433,484 | ​ | ​ | 433,484
Unamortized debt discount and issuance costs | ​ | ​ | (47,967) | ​ | ​ | (56,364)
Net long-term debt | ​ | $ | 385,517 | ​ | $ | 377,120
Aggregate scheduled maturities of long-term debt | The aggregate scheduled maturities of our long-term debt as of December 31, 2020 are as follows: ​
​ | ​ | ​ | ​
(In thousands) |  | ​ | ​
Years ending December 31: | ​ | ​ | ​
2021 to 2022 | ​ | $ | —
2023 | ​ |  | 240,984
2024 | ​ |  | —
2025 | ​ |  | 192,500
Total | ​ | $ | 433,484
2025 Notes |
Debt |
Summary of liability and equity components of convertible notes | Our outstanding 2025 Notes balances consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(In thousands) |  | 2020 |  | 2019
Liability component |  | ​ | ​ | ​ | ​ |
Principal | ​ | $ | 192,500 | ​ | $ | 192,500
Debt discount and issuance costs, net | ​ |  | (46,766) | ​ |  | (54,597)
Net carrying amount | ​ | $ | 145,734 | ​ | $ | 137,903
Equity component, net | ​ | $ | 65,361 | ​ | $ | 65,361
Schedule of components of interest expense | The following table sets forth total interest expense recognized related to the 2025 Notes for the years ended December 31, 2020, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
Contractual interest expense | ​ | $ | 4,813 | ​ | $ | 4,813 | ​ | $ | 4,799
Amortization of debt issuance costs | ​ |  | 601 | ​ |  | 551 | ​ |  | 505
Amortization of debt discount | ​ |  | 7,230 | ​ |  | 6,618 | ​ |  | 6,071
Total interest and amortization expense | ​ | $ | 12,644 | ​ | $ | 11,982 | ​ | $ | 11,375

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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