Annual report pursuant to Section 13 and 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 ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 13,466 $ 17,216
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Due within one year, Amortized Cost 5,237  
Due after one year through five years, Amortized Cost 6,312  
Amortized Cost 11,549  
Due within one year, Fair Value 5,229  
Due after one year through five years, Fair Value 6,293  
Fair Value $ 11,522 $ 16,143