Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents And Investments (Schedule Of Estimated Fair Value Of Available-For-Sale Securities) (Details)

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Cash Equivalents And Investments (Schedule Of Estimated Fair Value Of Available-For-Sale Securities) (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 15,934,000 $ 17,216,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Due within one year, Amortized Cost 2,884,000  
Due after one year through five years, Amortized Cost 10,576,000  
Amortized Cost 13,460,000  
Due within one year, Fair Value 2,885,000  
Due after one year through five years, Fair Value 10,576,000  
Fair Value $ 13,461,000 $ 16,143,000