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Segment Information, Operations By Geographic Area And Customer Concentration (Schedule Of Reportable Segment And Reconciliation Of Segment Contribution Income To Income Before Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Segment Reporting Information [Line Items]        
Total net revenues $ 357,719 $ 320,655 $ 651,118 $ 646,275
Total segment contribution income 50,327 47,597 92,247 99,644
Corporate and unallocated costs (13,558) (12,201) (26,024) (23,564)
Amortization of intangible assets (4,872) [1] (1,016) [1] (6,343) [1] (1,963) [1]
Stock-based compensation expense (4,391) (3,395) (7,981) (6,787)
Restructuring and other charges (1,587) 0 (1,557) 0
Acquisition related compensation (214) 0 (924) 0
Impact to cost of sales from acquisition accounting adjustments to inventory (568) 0 (568) 0
Litigation reserves, net (3,555) 0 (3,603) (151)
Interest income 95 116 244 235
Other income (expense), net (548) 354 (474) (247)
Income before income taxes 21,129 31,455 45,017 67,167
Retail [Member]
       
Segment Reporting Information [Line Items]        
Total net revenues 117,395 113,824 243,717 242,801
Total segment contribution income 15,761 18,559 34,379 44,831
Segment contribution margin (in percentage) 13.40% 16.30% 14.10% 18.50%
Commercial [Member]
       
Segment Reporting Information [Line Items]        
Total net revenues 88,446 80,626 159,297 155,258
Total segment contribution income 20,476 19,429 34,287 32,274
Segment contribution margin (in percentage) 23.20% 24.10% 21.50% 20.80%
Service Provider [Member]
       
Segment Reporting Information [Line Items]        
Total net revenues 151,878 126,205 248,104 248,216
Total segment contribution income $ 14,090 $ 9,609 $ 23,581 $ 22,539
Segment contribution margin (in percentage) 9.30% 7.60% 9.50% 9.10%
[1] Amount excludes amortization expense related to patents within purchased intangible assets in costs of revenues.