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Goodwill and Other Intangible Assets (Schedule of changes in goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Beginning balance $ 0us-gaap_Goodwill
Acquisition of Fiberblaze 12,242us-gaap_GoodwillAcquiredDuringPeriod
Ending balance $ 12,242us-gaap_Goodwill