Warranties (Tables)

6 Months Ended

Jun. 30, 2016

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Three months ended						Six months ended
	June 30, 2016			June 30, 2015			June 30, 2016			June 30, 2015
Warranty accrual:	(in thousands)
Balance, beginning of period	$	8,130		$	8,105		$	8,469		$	8,130
Payments made	(1,004		)	(1,117		)	(1,657		)	(2,003		)
Provisions	1,328			1,104			1,642			1,965
Balance, end of period	$	8,454		$	8,092		$	8,454		$	8,092
Warranty expense:	$	1,328		$	1,104		$	1,642		$	1,965