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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Current Available-for-sale Marketable Debt Securities | At December 31, 2020, current available-for-sale marketable debt securities were as follows:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (In thousands)
Treasury discount notes | $ | 49,995 |  |  | $ | — |  |  | $ | — |  |  | $ | 49,995 |
Total available-for-sale marketable debt securities | $ | 49,995 |  |  | $ | — |  |  | $ | — |  |  | $ | 49,995 |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present the Company’s financial instruments that are measured at fair value on a recurring basis:
| December 31, 2020
| Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value Measurements
| (In thousands)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 374,014 |  |  | $ | — |  |  | $ | — |  |  | $ | 374,014 |
Treasury discount notes | — |  |  | 324,995 |  |  | — |  |  | 324,995 |
Time deposits | — |  |  | 2,721 |  |  | — |  |  | $ | 2,721 |
Marketable debt securities: |  |  |  |  |  |  |
Treasury discount notes | — |  |  | 49,995 |  |  | — |  |  | 49,995 |
Total | $ | 374,014 |  |  | $ | 377,711 |  |  | $ | — |  |  | $ | 751,725 |
| December 31, 2019
| Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total Fair Value Measurements
| (In thousands)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 291,810 |  |  | $ | — |  |  | $ | — |  |  | $ | 291,810 |
Time deposits | — |  |  | 23,040 |  |  | — |  |  | 23,040 |
Total | $ | 291,810 |  |  | $ | 23,040 |  |  | $ | — |  |  | $ | 314,850 |
Schedule of Carrying Value and Fair Value of Financial Instruments | The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:
| December 31, 2020 |  | December 31, 2019
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
| (In thousands)
Current portion of long-term debt | $ | — |  |  | $ | — |  |  | $ | (13,750) |  |  | $ | (13,681) |
Long-term debt, net(a) | (712,277) |  |  | (725,700) |  |  | (231,946) |  |  | (232,581) |
_________________ (a) At December 31, 2020 and 2019, the carrying value of long-term debt, net includes unamortized debt issuance costs of $7.7 million and $1.8 million, respectively.

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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