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Fair Value Of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Of Financial Instruments [Abstract] 
Estimated Fair Values Of Financial Instruments
     September 30, 2011      December 31, 2010  
     (Amounts in thousands)  

Assets

     

Investments

   $ 3,037,561       $ 3,155,257   

Interest rate swap agreements

   $ 0       $ 4,240   

Liabilities

     

Interest rate swap agreements

   $ 1,348       $ 3,042   

Equity contracts

   $ 625       $ 2,776   

Secured notes

   $ 138,000       $ 138,332   

Unsecured note

   $ 0       $ 128,280