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Summary of Significant Accounting Policies (Schedule of Product Warranty Liability) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]    
Product warranty and recall at beginning of period $ 6,419 $ 7,601
Accruals for products shipped during period 4,999 4,609
Aggregate changes in pre-existing liabilities due to claim developments (116) (156)
Settlements made during the period (1,958) (5,635)
Product warranty and recall at end of period $ 9,344 $ 6,419