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Additional Financial Statement Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Accrued customer advances	$ 6,146	$ 846
Accrued commissions	1,758	299
Kelk [Member]
Accrued customer advances	5,000
Accrued commissions	$ 1,500

Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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