Basis of Presentation - Goodwill Impairment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended
Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2012	Jul. 01, 2012 VHS [Member] Second Quarter of 2012 Impairment [Member]	Sep. 30, 2012 Vocollect Supply Chain [Member] Third Quarter of 2012 Impairment [Member]	Sep. 30, 2012 Restatement Adjustment [Member]
Goodwill, Impairment Loss	$ 0	$ 32,369	$ 0	$ 47,294	$ 51,200	$ 5,300	$ 500	$ 5,780

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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