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Summary of Significant Accounting Policies (Schedule of Product Warranty Liability) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]    
Product warranty and recall at beginning of period $ 9,344 $ 6,419
Accruals for products shipped during period 4,933 4,978
Assumed warranty liability 899  
Aggregate changes in pre-existing liabilities due to claim developments 4,899 (116)
Settlements made during the period (10,407) (1,967)
Foreign currency translation 311 30
Product warranty and recall at end of period $ 9,979 $ 9,344