Liability for Warranty Returns (Tables)

6 Months Ended

Jun. 30, 2011

Liability for Warranty Returns [Abstract]

Summary of warranty expense and write-off activity

Six Months Ended June 30,
(In thousands)	2011			2010
Balance at beginning of period	$	3,304		$	2,833
Plus: Amounts charged to cost and expenses		1,525			1,377
Less: Deductions		(1,183	)		(1,050	)
Balance at end of period	$	3,646		$	3,160