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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value and Carrying Value of Convertible Senior Notes (Details) - Level 2 - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | $ 4,742,466 | $ 2,586,924
Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 7,476,770 | 5,693,241
2031 Senior Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 986,420 | 0
2031 Senior Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 1,032,250 | 0
2026 Senior Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 986,924 | 0
2026 Senior Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 1,017,070 | 0
2027 Convertible Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 566,873 | 458,496
2027 Convertible Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 685,297 | 644,000
2026 Convertible Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 567,195 | 482,204
2026 Convertible Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 659,404 | 638,250
2025 Convertible Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 989,599 | 858,332
2025 Convertible Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 2,051,760 | 1,912,440
2023 Convertible Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 640,818 | 780,046
2023 Convertible Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 1,982,159 | 2,417,820
2022 Convertible Notes | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | 4,637 | 7,846
2022 Convertible Notes | Fair Value (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible notes | $ 48,830 | $ 80,731

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