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Fair Value Measurements (Valuation Techniques) (Details) | 12 Months Ended
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Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage | 9.20%

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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. + References No definition available. + Details
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