Contingencies (Tables)

9 Months Ended

Sep. 30, 2011

Contingencies [Abstract]

Changes in Corporation's accruals for estimated product warranties

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2011			2010			2011			2010
(In thousands)
Balance at beginning of period	$	3,107		$	2,798		$	2,574		$	3,064
Acquired liabilities for warranties		609			—			609			—
Liabilities accrued for warranties issued during the period		853			404			2,444			1,141
Warranty claims paid during the period		(1,595	)		(453	)		(2,577	)		(1,471	)
Changes in liability for pre-existing warranties during the period, including expirations		14			10			(62	)		25
Balance at end of period	$	2,988		$	2,759		$	2,988		$	2,759