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INDEBTEDNESS - Net Carrying Amount of Equity Component of Convertible Notes (Details) - Convertible Debt - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 05, 2020 | May 25, 2018 | Mar. 06, 2017
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Debt Instrument [Line Items] |  |  |  |
Amount allocated to conversion option | $ 509,524 |  |  |
Less: allocated issuance costs | (6,816) |  |  |
Equity component, net | 502,708 |  |  |
2027 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount allocated to conversion option | 111,000 |  |  |
Less: allocated issuance costs | (1,793) |  |  |
Equity component, net | 109,207 |  |  |
2026 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount allocated to conversion option | 87,000 |  |  |
Less: allocated issuance costs | (1,405) |  |  |
Equity component, net | 85,595 |  |  |
2025 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount allocated to conversion option | 154,600 |  |  |
Less: allocated issuance costs | (2,342) |  |  |
Equity component, net | 152,258 | $ 154,600 |  |
2023 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount allocated to conversion option | 155,250 |  |  |
Less: allocated issuance costs | (1,231) |  |  |
Equity component, net | 154,019 |  | $ 155,300 |
2022 Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount allocated to conversion option | 1,674 |  |  |
Less: allocated issuance costs | (45) |  |  |
Equity component, net | $ 1,629 |  |  | $ 86,200

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- Definition Debt Instrument, Convertible, Carrying Amount of Equity Component, Gross + References No definition available. + Details
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- Definition Debt Issuance Costs, Amount Allocated to Equity Component of Convertible Debt + References No definition available. + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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