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Fair Value Measurements And Marketable Securities (Marketable Debt Securities) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities, Amortized Cost $ 21,041,000 $ 30,912,000
Total debt securities, Gross Unrealized Gains 311,000 434,000
Total debt securities, Gross Unrealized Losses (2,000) (9,000)
Total debt securities, Estimated Fair Value 21,350,000 31,337,000
Total debt securities, Other-than-temporary Impairments      
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]    
Total debt securities, Amortized Cost 627,000 2,167,000
Total debt securities, Gross Unrealized Gains 26,000 82,000
Total debt securities, Gross Unrealized Losses      
Total debt securities, Estimated Fair Value 653,000 2,249,000
Total debt securities, Other-than-temporary Impairments      
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]    
Total debt securities, Other-than-temporary Impairments      
Municipal bonds - available for sale, Amortized Cost 20,414,000 28,745,000
Municipal bonds - available for sale, Gross Unrealized Gains 285,000 352,000
Municipal bonds - available for sale, Gross Unrealized Losses (2,000) (9,000)
Total debt securities $ 20,697,000 $ 29,088,000