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Debt (Details) - Convertible Debt (Parentheticals) | Sep. 30, 2020 | Dec. 31, 2019
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4.875% Convertible Senior Notes Due 2020 [Member] |  |
Debt (Details) - Convertible Debt (Parentheticals) [Line Items] |  |
Debt Instrument, Interest Rate | 4.875% | 4.875%
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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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