Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,960	$ 12,597
Accumulated Amortization	(6,754)	(6,108)
Net Carrying Value	6,206	6,489
Weighted Average Useful Life (in Years)	4 years 4 months 24 days	4 years 10 months 24 days
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,490	7,490
Accumulated Amortization	(3,924)	(3,480)
Net Carrying Value	3,566	4,010
Weighted Average Useful Life (in Years)	4 years 1 month 6 days	4 years 7 months 6 days
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,267	3,267
Accumulated Amortization	(1,981)	(1,853)
Net Carrying Value	1,286	1,414
Weighted Average Useful Life (in Years)	5 years	5 years 9 months 18 days
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,744	1,840
Accumulated Amortization	(849)	(775)
Net Carrying Value	895	1,065
Weighted Average Useful Life (in Years)	5 years	5 years 2 months 12 days
Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	459
Net Carrying Value	$ 459
Weighted Average Useful Life (in Years)	0 years