Warranties (Tables)

9 Months Ended

Sep. 30, 2017

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Three months ended						Nine months ended
	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Warranty accrual:	(in thousands)
Balance, beginning of period	$	8,602		$	8,454		$	7,936		$	8,469
Payments made	(2,281		)	(1,331		)	(5,935		)	(2,988		)
Provisions	3,277			1,012			7,597			2,654
Balance, end of period	$	9,598		$	8,135		$	9,598		$	8,135
Warranty expense:	$	3,277		$	1,012		$	7,597		$	2,654