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Fair Value of Financial Instruments (Details 2) - 1.375% Convertible senior notes due 2023 - Convertible senior notes - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt instrument |  |
Face value | $ 172,500 | $ 172,500
Carrying value | 163,687 | 156,031
Fair Value | $ 254,103 | $ 194,709

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