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Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Parentheticals) - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions | Dec. 31, 2019 USD ($)
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3.25% Convertible Senior Notes Due 2023 [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
New issuance face value | $ 29.6
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
New issuance face value | $ 8.0

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