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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranty Accrual Included in Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 20,132 $ 20,520
Provision for warranties issued in current year 8,026 5,873
Liability adjustment due to divestiture of business (420) 0
Supreme acquisition 0 1,421
Provision for pre-existing warranties 0 (970)
Payments (5,491) (6,712)
Balance at end of period $ 22,247 $ 20,132