Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,597	$ 12,309
Accumulated Amortization	(6,108)	(4,421)
Net Carrying Value	6,489	7,888
Weighted Average Useful Life (in Years)	4 years 10 months 24 days	4 years 10 months 24 days
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,490	7,352
Accumulated Amortization	(3,480)	(2,570)
Net Carrying Value	4,010	4,782
Weighted Average Useful Life (in Years)	4 years 7 months 6 days	5 years 6 months
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,267	3,188
Accumulated Amortization	(1,853)	(1,356)
Net Carrying Value	1,414	1,832
Weighted Average Useful Life (in Years)	5 years 9 months 18 days	3 years 8 months 12 days
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,840	1,769
Accumulated Amortization	(775)	(495)
Net Carrying Value	$ 1,065	$ 1,274
Weighted Average Useful Life (in Years)	5 years 2 months 12 days	4 years 10 months 24 days