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NEW ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Convertible senior notes, net | $ 588,418 |  | $ 518,203 |  |
Impact of ASU adoption | 478,925 |  | 542,172 | $ 566,611 | $ 539,010
Accounting Standards Update 2020-06 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Convertible senior notes, net |  | $ 587,700 |  |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of ASU adoption | $ 340,223 |  | 339,879 | $ 383,142 | $ 410,919
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of ASU adoption |  |  | (52,205) |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Convertible senior notes, net |  | $ 69,500 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of ASU adoption |  |  | 9,399 |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Accounting Standards Update 2020-06 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of ASU adoption |  |  | $ 9,400 |  |

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