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Debt And Credit Arrangements - Fair Value Disclosures about Debt (Details) - Convertible Debt | Mar. 31, 2018 | Dec. 31, 2017
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Convertible Notes, due 2024 |  |
Debt Instrument |  |
Debt instrument percentage over par value | 117.00% | 105.00%
Convertible Notes, Due 2018 |  |
Debt Instrument |  |
Debt instrument percentage over par value | 102.00% | 99.00%

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