Quarterly report pursuant to Section 13 or 15(d)

Reserve for Product Warranties - Narrative (Details)

v3.10.0.1
Reserve for Product Warranties - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Product Warranties Disclosures [Abstract]            
Product warranty period (in years) 1 year          
Product Liability Contingency [Line Items]            
Accrual of estimated costs $ 9,065 $ 10,913 $ 10,995 $ 12,433 $ 14,139 $ 10,670
Certain products            
Product Liability Contingency [Line Items]            
Accrual of estimated costs $ 4,200