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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Product Warranties Disclosures [Abstract]  
Warranty liabilities, balance at December 31, 2017 $ 44,398
Warranty claims (42,696)
Warranty accruals 46,117
Warranty liabilities, balance at June 30, 2018 $ 47,819