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Investments (Cost And Estimated Fair Value Of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]        
Cost $ 6,410 $ 5,312    
Gross unrealized gain 1,599 2,687    
Gross unrealized loss (54) (54)    
Fair value, investments 7,955 7,945    
Less cash equivalents, Carrying amount 837 1,505 771 1,102
Money Market [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 300 540    
Gross unrealized gain 0 0    
Gross unrealized loss 0 0    
Fair value, investments 300 540    
Commercial Paper [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 345 601    
Gross unrealized gain 0 0    
Gross unrealized loss 0 0    
Fair value, investments 345 601    
Treasury Bills [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 6,333 5,226    
Gross unrealized gain 1 1    
Gross unrealized loss 0 0    
Fair value, investments 6,334 5,227    
Equity Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 77 86    
Gross unrealized gain 1,598 2,686    
Gross unrealized loss (54) (54)    
Fair value, investments 1,621 2,718    
Debt and Equity Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 7,055 6,453    
Gross unrealized gain 1,599 2,687    
Gross unrealized loss (54) (54)    
Fair value, investments 8,600 9,086    
Less Cash Equivalents [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Gross unrealized gain 0 0    
Gross unrealized loss 0 0    
Less cash equivalents, Carrying amount 645 1,141    
Less cash equivalents, Fair value $ 645 $ 1,141