Accrued Warranty Costs (Tables)

6 Months Ended

Jun. 30, 2014

Guarantees [Abstract]

Changes in Product Warranty Obligation (Accrued Warranty Costs)

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

	Six Months Ended						Three Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
	(In Thousands)
Balance at beginning of period	$	7,297		$	6,172		$	7,578		$	6,486
Amounts charged to costs and expenses		3,695			4,011			1,468			2,021
Costs incurred		(3,291	)		(3,239	)		(1,345	)		(1,563	)
Balance at end of period	$	7,701		$	6,944		$	7,701		$	6,944