Warranties (Tables)

12 Months Ended

Dec. 31, 2015

Guarantees [Abstract]

Warranty

Changes in the warranty accrual are as follows:

	Years Ending December 31,
	2015			2014			2013
Warranty accrual:	(in thousands)
Balance, beginning of period	$	8,130		$	7,352		$	5,776
Payments made	(3,978		)	(4,096		)	(4,448		)
Provisions	4,317			4,874			6,005
Adjustments related to changes in estimates	—			—			19
Balance, end of period	$	8,469		$	8,130		$	7,352
Warranty expense:	$	4,317		$	4,874		$	6,024