Goodwill and Identified Intangibles (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2012	Dec. 31, 2011
Identifiable intangibles:
Gross Carrying Amount	$ 228,227	$ 228,227
Accumulated Amortization	(148,116)	(140,576)
Net Carrying Amount	80,111	87,651
Existing and core technology [Member]
Identifiable intangibles:
Gross Carrying Amount	136,145	136,145
Accumulated Amortization	(87,310)	(81,951)
Net Carrying Amount	48,835	54,194
Customer relationships/contracts [Member]
Identifiable intangibles:
Gross Carrying Amount	67,098	67,098
Accumulated Amortization	(43,649)	(42,142)
Net Carrying Amount	23,449	24,956
Trademarks and trade names [Member]
Identifiable intangibles:
Gross Carrying Amount	11,361	11,361
Accumulated Amortization	(8,060)	(7,700)
Net Carrying Amount	3,301	3,661
Supply agreements [Member]
Identifiable intangibles:
Gross Carrying Amount	3,414	3,414
Accumulated Amortization	(3,414)	(3,414)
Maintenance agreements and related relationships [Member]
Identifiable intangibles:
Gross Carrying Amount	7,100	7,100
Accumulated Amortization	(2,574)	(2,260)
Net Carrying Amount	4,526	4,840
Software license, intellectual property and assembled workforce [Member]
Identifiable intangibles:
Gross Carrying Amount	309	309
Accumulated Amortization	(309)	(309)
Order backlog [Member]
Identifiable intangibles:
Gross Carrying Amount	2,800	2,800
Accumulated Amortization	$ (2,800)	$ (2,800)