Warranties (Tables)

6 Months Ended

Jun. 30, 2014

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Three months ended						Six months ended
	June 30, 2014			June 30, 2013			June 30, 2014			June 30, 2013
Warranty accrual:	(in thousands)
Balance, beginning of period	$	7,448		$	5,890		$	7,352		$	5,776
Payments made	(1,242		)	(1,184		)	(2,135		)	(1,917		)
Provisions	1,569			2,060			2,558			2,907
Balance, end of period	$	7,775		$	6,766		$	7,775		$	6,766
Warranty expense:	$	1,569		$	2,196		$	2,558		$	3,043