Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 14,167	$ 14,160
Accumulated Amortization	(8,845)	(7,698)
Net Carrying Value	5,322	6,463
Weighted Average Useful Life (in Years)	3 years 1 month 6 days	3 years 6 months
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,142	8,152
Accumulated Amortization	(5,410)	(4,587)
Net Carrying Value	2,732	3,566
Weighted Average Useful Life (in Years)	2 years 10 months 25 days	3 years 7 months 6 days
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,267	3,267
Accumulated Amortization	(2,303)	(2,110)
Net Carrying Value	964	1,157
Weighted Average Useful Life (in Years)	3 years 9 months 18 days	4 years 6 months
Other Intangible Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,849	1,874
Accumulated Amortization	(1,132)	(1,001)
Net Carrying Value	717	873
Weighted Average Useful Life (in Years)	2 years 4 months 24 days	3 years 1 month 6 days
Computer Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	909	867
Net Carrying Value	$ 909	$ 867
Weighted Average Useful Life (in Years)	3 years	3 years