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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Product Warranties Disclosures [Abstract]  
Warranty liabilities, balance at December 31, 2017 $ 44,398
Warranty claims (68,104)
Warranty accruals 75,883
Warranty liabilities, balance at September 30, 2018 $ 52,177