Liability for Warranty Returns (Tables)

9 Months Ended

Sep. 30, 2018

Product Warranties Disclosures [Abstract]

Summary of Warranty Expense and Write-Off Activity

A summary of warranty expense and write-off activity for the three and nine months ended September 30, 2018 and 2017 is as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In thousands)	2018			2017			2018			2017
Balance at beginning of period	$	10,111		$	9,180		$	9,724		$	8,548
Plus: Amounts charged to cost and expenses		(34	)		4,087			6,649			6,401
Less: Deductions		(1,053	)		(2,328	)		(7,349	)		(4,010	)
Balance at end of period	$	9,024		$	10,939		$	9,024		$	10,939