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Fair Value Measurements And Marketable Securities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value Disclosures [Abstract]      
Proceeds from maturities or sales of available-for-sale securities $ 2,600 $ 2,600 $ 5,900