Warranties (Tables)

12 Months Ended

Dec. 31, 2018

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Years Ending December 31,
	2018			2017			2016
Warranty accrual:	(in thousands)
Balance, beginning of period	$	10,483		$	7,936		$	8,469
Payments made	(7,869		)	(8,686		)	(4,134		)
Provisions	9,669			11,233			3,601
Change in estimate	(862		)	—			—
Balance, end of period	$	11,421		$	10,483		$	7,936
Warranty expense:	$	8,807		$	11,233		$	3,601