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Rollforward of Warranty Reserve (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Disclosure Rollforward Of Warranty Reserve [Abstract]  
Standard and Extended Product Warranty Accrual, Additions from Business Acquisition $ 6,474
Beginning balance 40,851
Warranty expense 41,699
Warranty claims (38,926)
Ending balance $ 50,098