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Fair Value Measurements And Marketable Securities (Contractual Maturities Of Available For Sale Investments) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturing in one year or less $ 1,565,000 $ 4,134,000
Maturing after one year through three years 7,151,000 21,089,000
Maturing after three years 12,634,000 6,114,000
Total debt securities 21,350,000 31,337,000
Municipal Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturing in one year or less 15,000 34,000
Maturing after one year through three years 638,000 2,215,000
Maturing after three years      
Total debt securities 653,000 2,249,000
Municipal Bonds - Available For Sale [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturing in one year or less 1,550,000 4,100,000
Maturing after one year through three years 6,513,000 18,874,000
Maturing after three years 12,634,000 6,114,000
Total debt securities $ 20,697,000 $ 29,088,000