Warranties (Tables)

6 Months Ended

Jun. 30, 2017

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Three months ended						Six months ended
	June 30, 2017			June 30, 2016			June 30, 2017			June 30, 2016
Warranty accrual:	(in thousands)
Balance, beginning of period	$	7,812		$	8,130		$	7,936		$	8,469
Payments made	(2,312		)	(1,004		)	(3,654		)	(1,657		)
Provisions	3,102			1,328			4,320			1,642
Balance, end of period	$	8,602		$	8,454		$	8,602		$	8,454
Warranty expense:	$	3,102		$	1,328		$	4,320		$	1,642