Warranties (Tables)

9 Months Ended

Sep. 30, 2013

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Three months ended						Nine months ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Warranty accrual:	(in thousands)
Balance, beginning of period	$	6,766		$	6,575		$	5,776		$	6,093
Payments made	(1,477		)	(1,036		)	(3,394		)	(3,128		)
Provisions	2,238			1,129			5,145			3,703
Balance, end of period	$	7,527		$	6,668		$	7,527		$	6,668
Warranty expense:	$	2,289		$	1,129		$	5,332		$	3,703