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Warranties (Tables)
3 Months Ended
Mar. 31, 2019
Warranties Disclosure [Abstract]  
Warranty Rollforward Disclosure [Table Text Block]
Beginning(Payments)\Ending
BalanceCreditsAdditionsBalance
(in thousands)
Year ended December 31, 2018$246(37)182$391
Three months ended March 31, 2019$391(22)1$370