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Debt (Details) - Convertible Debt (Parentheticals) | Jun. 30, 2021 | Dec. 31, 2020
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3.25% Convertible Senior Notes Due 2023 [Member] |  |
Debt (Details) - Convertible Debt (Parentheticals) [Line Items] |  |
Debt Instrument, Interest Rate | 3.25% | 3.25%

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