COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 2011

COMMITMENTS AND CONTINGENCIES.

Summary of the activity related to the product warranty liability

	Three Months Ended						Six Months Ended
	June 30, 2011			June 30, 2010			June 30, 2011			June 30, 2010
	(in thousands)
Balance at beginning of period	$	4,908		$	4,394		$	4,019		$	4,225
Accrual for warranties during the period, net of change in estimates		1,653			493			3,857			2,166
Actual costs incurred		(1,454	)		(778	)		(2,769	)		(2,282	)
Balance at end of period	$	5,107		$	4,109		$	5,107		$	4,109