Quarterly report pursuant to Section 13 or 15(d)

Investments And Restricted Deposits (Schedule Of Available-For-Sale Investments In A Continuous Unrealized Loss Position) (Details)

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Investments And Restricted Deposits (Schedule Of Available-For-Sale Investments In A Continuous Unrealized Loss Position) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Less than 12 Months, Unrealized Losses $ (832) $ (790)
Less than 12 Months, Fair Value 46,056 58,413
12 Months or More, Unrealized Losses    
12 Months or More, Fair Value    
U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
   
Less than 12 Months, Unrealized Losses (2) (140)
Less than 12 Months, Fair Value 2,117 9,246
12 Months or More, Unrealized Losses    
12 Months or More, Fair Value    
Corporate Securities [Member]
   
Less than 12 Months, Unrealized Losses (757) (586)
Less than 12 Months, Fair Value 29,224 40,341
12 Months or More, Unrealized Losses    
12 Months or More, Fair Value    
Municipal Securities, General Obligation [Member]
   
Less than 12 Months, Unrealized Losses (57) (6)
Less than 12 Months, Fair Value 7,676 1,131
12 Months or More, Unrealized Losses    
12 Months or More, Fair Value    
Municipal Securities, Revenue [Member]
   
Less than 12 Months, Unrealized Losses (16) (15)
Less than 12 Months, Fair Value 7,039 2,419
12 Months or More, Unrealized Losses    
12 Months or More, Fair Value    
Asset Backed Securities [Member]
   
Less than 12 Months, Unrealized Losses   (43)
Less than 12 Months, Fair Value   5,276
12 Months or More, Unrealized Losses    
12 Months or More, Fair Value