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Fair Value Measurements and Auction Rate Securities (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Auction Market Preferred Securities, Stock Series, Value $ 2,425,000    
Other than temporary impairment losses     469,000
Balance as of 1,956,000 2,001,000  
Recognized gains included in earnings (1) 0 9,000  
Settlements 0 (35,000)  
Balance as of $ 1,956,000 $ 1,975,000