Intangibles (Schedule Of Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 171,481	$ 167,493
Accumulated Amortization	(90,439)	(83,627)
Net Carrying Amount	81,042	83,866
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	57,004	53,086
Accumulated Amortization	(33,176)	(29,606)
Net Carrying Amount	23,828	23,480
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,989	67,918
Accumulated Amortization	(34,633)	(32,210)
Net Carrying Amount	33,356	35,708
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,602	21,875
Accumulated Amortization	(8,351)	(7,992)
Net Carrying Amount	14,251	13,883
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23,886	24,614
Accumulated Amortization	(14,279)	(13,819)
Net Carrying Amount	$ 9,607	$ 10,795