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Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 349 $ 969
Product warranty adjustments 1,510 149
Payments and settlements (331) (471)
Ending balance $ 1,528 $ 349