COMMITMENTS AND CONTINGENCIES (Tables)

9 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Summary of the activity related to the product warranty liability

The following table summarizes the activity related to the product warranty liability for the three and nine months ended September 30, 2012 and 2011.

	Three Months Ended						Nine Months Ended
	September 30, 2012			September 30, 2011			September 30, 2012			September 30, 2011
	(in thousands)
Balance at beginning of period	$	5,665		$	5,107		$	5,746		$	4,019
Accrual for warranties during the period, net of change in estimate	443			1,593			3,066			5,450
Actual costs incurred	(1,146		)	(1,355		)	(3,850		)	(4,124		)
Balance at end of period	$	4,962		$	5,345		$	4,962		$	5,345