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INDEBTEDNESS - Net Carrying Amount of Convertible Notes (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Mar. 05, 2020 | May 25, 2018 | Mar. 06, 2017
--- | --- | --- | --- | --- | ---
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | $ 4,797,153 | $ 3,021,045 |  |  |
Unamortized debt issuance costs | (54,687) |  |  |  |
Unamortized debt discount |  | (405,163) |  |  |
Unamortized debt issuance costs |  | (28,958) |  |  |
Net carrying value | 4,742,466 | 2,586,924 |  |  |
2031 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 1,000,000 |  |  |  |
Unamortized debt issuance costs | (13,580) |  |  |  |
Net carrying value | 986,420 |  |  |  |
2026 Senior Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 1,000,000 |  |  |  |
Unamortized debt issuance costs | (13,076) |  |  |  |
Net carrying value | 986,924 |  |  |  |
2027 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying value | 566,873 |  |  |  |
2027 Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 575,000 | 575,000 |  |  |
Unamortized debt issuance costs | (8,127) |  |  |  |
Unamortized debt discount |  | (109,134) |  |  |
Unamortized debt issuance costs |  | (7,370) |  |  |
Net carrying value | 566,873 | 458,496 |  |  |
2026 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying value | 567,195 |  |  |  |
2026 Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 575,000 | 575,000 |  |  |
Unamortized debt issuance costs | (7,805) |  |  |  |
Unamortized debt discount |  | (85,085) |  |  |
Unamortized debt issuance costs |  | (7,711) |  |  |
Net carrying value | 567,195 | 482,204 |  |  |
2025 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying value | 989,599 |  |  |  |
2025 Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 1,000,000 | 1,000,000 |  |  |
Unamortized debt issuance costs | (10,401) |  |  |  |
Unamortized debt discount |  | (130,335) |  |  |
Unamortized debt issuance costs |  | (11,333) | $ (12,800) |  |
Net carrying value | 989,599 | 858,332 |  |  |
2023 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying value | 640,818 |  |  |  |
2023 Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 642,488 | 862,500 |  |  |
Unamortized debt issuance costs | (1,670) |  |  |  |
Unamortized debt discount |  | (79,980) |  |  |
Unamortized debt issuance costs |  | (2,474) |  | $ (5,600) |
Net carrying value | 640,818 | 780,046 |  |  |
2022 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying value | 4,637 |  |  |  |
2022 Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding | 4,665 | 8,545 |  |  |
Unamortized debt issuance costs | (28) |  |  |  |
Unamortized debt discount |  | (629) |  |  |
Unamortized debt issuance costs |  | (70) |  |  | $ (9,400)
Net carrying value | $ 4,637 | $ 7,846 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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