Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Activity in our Warranty Reserves

A summary of the activity in our warranty reserves is as follows (in thousands):

	Year Ended December 31,
	2011			2010			2009
Balance, beginning of year	$	2,222		$	1,936		$	1,761
Amount charged to expense for estimated warranty costs		105			1,283			952
Deductions for actual costs incurred		(571	)		(997	)		(777	)
Balance, end of year	$	1,756		$	2,222		$	1,936