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Product Warranty (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Summary of product warranty activity    
Beginning balance $ 1,916 $ 2,074
Charges to expense 1,169 1,156
Costs incurred (904) (1,191)
Ending balance $ 2,181 $ 2,039