Accrued Warranty Costs (Tables)

12 Months Ended

Dec. 31, 2012

Changes in Product Warranty Obligation

Changes in our product warranty obligation (accrued warranty costs) are as follows:

	2012			2011			2010
				(In Thousands)
Balance at beginning of year	$	5,370		$	3,996		$	3,138
Amounts charged to costs and expenses		6,710			6,539			4,479
Costs incurred		(5,908	)		(5,165	)		(3,621	)
Balance at end of year	$	6,172		$	5,370		$	3,996