Commitments and Contingencies Sales Return Liability (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 29, 2013	Jun. 30, 2012
Sales return liability [Roll Forward]
Balance at beginning of year	$ 5,330	$ 4,402
Additions that reduce net sales	23,388	22,480
Deductions from reserves	(22,963)	(21,765)
Acquired sales return reserve	50	0
Balance at end of period	$ 5,805	$ 5,117

Total deduction from sales during the period arising from goods returned by customers (other than under warranty provisions) and price reductions (allowance, price protection agreements) given by the entity. Returns and allowances are a deduction from gross revenue in arriving at net revenue.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_SalesReturnsAndAllowancesGoods
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration