Warranties (Tables)

3 Months Ended

Mar. 31, 2014

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Three months ended
	March 31, 2014			March 31, 2013
Warranty accrual:	(in thousands)
Balance, beginning of period	$	7,352		$	5,776
Payments made	(893		)	(733		)
Provisions	989			847
Balance, end of period	$	7,448		$	5,890
Warranty expense:	$	989		$	847