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Fair Value Measurements And Marketable Securities (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Fair Value Measurements And Marketable Securities [Abstract]    
Unrealized loss from marketable securities $ 56,000 $ 145,000
Unrealized gain/(loss) from marketable securities (173,000) 90,000
Proceeds from sales of available for sale of municipal bonds 10,597,000 1,503,000
Realized gains recorded in other income, investment and interest caption $ 183,000 $ 3,000