COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2012

COMMITMENTS AND CONTINGENCIES

Summary of the activity related to the product warranty liability

	Three Months Ended
	March 31,			March 31,
	2012			2011
	(in thousands)
Balance at beginning of period	$	5,746		$	4,019
Accrual for warranties during the period, net of change in estimates	1,287			2,204
Actual costs incurred	(1,309		)	(1,315		)
Balance at end of period	$	5,724		$	4,908