Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents And Investments (Narrative) (Details)

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Cash Equivalents And Investments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash Equivalents And Investments [Abstract]    
Gross realized gains (losses) $ 0 $ 0