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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Product Warranties Disclosures [Abstract]  
Warranty liabilities, balance at December 31, 2018 $ 52,220
Warranty claims (46,099)
Warranty accruals 48,449
Warranty liabilities, balance at June 30, 2019 $ 54,570