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Investments (Cost And Estimated Fair Value Of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]        
Cost $ 5,411 $ 5,312    
Gross unrealized gain 2,057 2,687    
Gross unrealized loss (55) (54)    
Fair value, investments 7,413 7,945    
Less cash equivalents, Carrying amount 1,682 1,505 825 1,102
Money Market [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 1,094 540    
Gross unrealized gain 0 0    
Gross unrealized loss 0 0    
Fair value, investments 1,094 540    
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 5,331 5,226    
Gross unrealized gain 2 1    
Gross unrealized loss 0 0    
Fair value, investments 5,333 5,227    
Equity Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 80 86    
Gross unrealized gain 2,055 2,686    
Gross unrealized loss (55) (54)    
Fair value, investments 2,080 2,718    
Debt and Equity Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Cost 6,850 6,453    
Gross unrealized gain 2,057 2,687    
Gross unrealized loss (55) (54)    
Fair value, investments 8,852 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 1,439 1,141    
Less cash equivalents, Fair value $ 1,439 $ 1,141