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Debt and Credit Arrangements - Fair Value Disclosures about Debt (Details) - Convertible Debt	Sep. 30, 2018	Dec. 31, 2017
Convertible Notes, due 2024
Debt Instrument
Debt instrument percentage over par value	140.00%	105.00%
Convertible Notes, Due 2018
Debt Instrument
Debt instrument percentage over par value		99.00%

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- Definition

Debt Instrument Fair Value. Percentage over Par Value

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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