Contingencies (Tables)

3 Months Ended

Mar. 31, 2012

Contingencies [Abstract]

Changes in Corporation's accruals for estimated product warranties

	Quarter Ended March  31,
	2012			2011
(In thousands)
Balance at beginning of period	$	3,213		$	2,574
Acquired liabilities for warranties		—			—
Liabilities accrued for warranties issued during the period		1,760			455
Warranty claims paid during the period		(709	)		(258	)
Changes in liability for pre-existing warranties during the period, including expirations		(196	)		(64	)
Balance at end of period	$	4,068		$	2,707