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Warranties (Tables)
9 Months Ended
Sep. 30, 2019
Warranties Disclosure [Abstract]  
Warranty Rollforward Disclosure [Table Text Block]
Beginning(Payments)\ProvisionEnding
BalanceCreditsIncrease/(Decrease)Balance
(in thousands)
Year ended December 31, 2018$246(37)182$391
Nine months ended September 30, 2019$391(4)(107)$280