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Summary of Significant Accounting Policies (Product Warranties) (Details) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Minimum product warranty term | 1 year
Maximum product warranty term | 20 years

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- Definition Maximum Product Warranties + References No definition available. + Details
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- Definition Minimum Product Warranties + References No definition available. + Details
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