Acquisitions Schedule Of Revenue And Net Income (Loss) For Vocollect, Including Amortization Of Intangibles And Other Purchase Accounting Charges Resulting From Acquisition (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012		Jul. 01, 2012		Apr. 01, 2012		Dec. 31, 2011		Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue, Net	$ 216,600	$ 192,800	[1]	$ 201,000	[1]	$ 179,700	[2]	$ 236,800	[3]	$ 211,800	$ 221,100	$ 178,500	$ 790,093	$ 848,181	$ 679,111
Vocollect Inc.
Segment Reporting Information [Line Items]
Revenue, Net													122,240	106,214
Net (loss) earnings													$ (18,802)	$ 412

[1] Net (loss) earnings, basic (loss) earnings per share, and diluted (loss) earnings per share for the second and third quarters of 2012 have been corrected from amounts previously reported, as described in the section below titled "Immaterial Restatement of Goodwill Impairment."2011Q1 Q2 Q3 Q43Revenues$178.5 $221.1 $211.8 $236.8Gross profit68.3 91.3 87.8 99.3Net (loss) earnings(6.0) (3.8) 0.7 (21.6) Basic (loss) earnings per share$(0.10) $(0.06) $0.01 $(0.36)Diluted (loss) earnings per share$(0.10) $(0.06) $0.01 $(0.36)3 In the fourth quarter of 2011, we recorded an expense of $20.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.

[2] In the first quarter of 2012, we recognized expense of $206.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.

[3] In the fourth quarter of 2011, we recorded an expense of $20.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.