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Commitments and Contingencies (Reconciliation of Changes in Product Warranty and Recall Liability) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Commitments and Contingencies [Abstract]    
Product warranty and recall at beginning of period $ 9,344 $ 6,419
Accruals for products shipped during period 3,288 1,835
Acquired warranty liability related to acquisition 1,462  
Aggregate changes in pre-existing liabilities due to claim developments 1,248 (145)
Settlements made during the period (6,804) (948)
Product warranty and recall at end of period $ 8,538 $ 7,161