Commitments and Contingencies (Tables)

3 Months Ended

Mar. 28, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability

Changes in the product warranty accrual are summarized as follows:

	Three months ended
	March 28, 2014			March 29, 2013
	(in thousands)
Balance, beginning of period	$	5,326		$	5,098
Payments made or service provided	(621		)	(876		)
Warranty expense	682			957
Foreign currency translation	2			(81		)
Balance, end of period	$	5,389		$	5,098