Litigation, Commitments and Contingencies Product Warranties (Tables)

3 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liabilities

The following table summarizes the warranty liability activity for the three-month periods ended March 31, 2013 and April 1, 2012, respectively (in thousands):

	March 31, 2013			April 1, 2012
Beginning balance	$	7,136		$	4,853
Payments or parts usage	(2,498		)	(1,425		)
Additional provision	1,512			1,793
Ending balance	$	6,150		$	5,221