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Product Warranties (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning Balance Standard Product Warranty Accrual $ 18,271
Issued – warranty expense 5,510
Acquired – warranty reserve 858
Change in estimate – warranty expense 282
Warranty usage (9,266)
Ending Balance Standard Product Warranty Accrual $ 15,655