Intangibles (Schedule Of Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 181,175	$ 186,407
Accumulated Amortization	(91,928)	(92,494)
Net Carrying Amount	89,247	93,913
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	41,970	45,064
Accumulated Amortization	(21,119)	(23,450)
Net Carrying Amount	20,851	21,614
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	88,792	89,876
Accumulated Amortization	(44,818)	(42,562)
Net Carrying Amount	43,974	47,314
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,407	24,046
Accumulated Amortization	(9,827)	(9,398)
Net Carrying Amount	14,580	14,648
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,006	27,421
Accumulated Amortization	(16,164)	(17,084)
Net Carrying Amount	$ 9,842	$ 10,337