Commitments and Contingencies (Tables)

6 Months Ended

Jun. 27, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability

Changes in the product warranty accrual are summarized as follows:

	Three months ended						Six months ended
	June 27, 2014			June 28, 2013			June 27, 2014			June 28, 2013
	(in thousands)
Balance, beginning of period	$	5,389		$	5,098		$	5,326		5,098
Payments made or service provided	(934		)	(955		)	(1,555		)	(1,831		)
Warranty expense	493			884			1,175			1,841
Foreign currency translation	(2		)	20			—			(61		)
Balance, end of period	$	4,946		$	5,047		$	4,946		$	5,047