Quarterly report pursuant to Section 13 or 15(d)

Investments And Restricted Deposits (Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits) (Details)

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Investments And Restricted Deposits (Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Investments [Member]
   
One year or less, Amortized Cost $ 104,914 $ 21,141
One year through five years, Amortized Cost 391,281 464,270
Five years through ten years, Amortized Cost 35,748 39,732
Greater than ten years, Amortized Cost 94,200 81,860
Total, Amortized Cost 626,143 607,003
One year or less, Fair Value 106,344 21,346
One year through five years, Fair Value 400,055 474,255
Five years through ten years, Fair Value 35,748 39,731
Greater than ten years, Fair Value 94,649 81,893
Total, Fair Value 636,796 617,225
Restricted Deposits [Member]
   
One year or less, Amortized Cost 19,605 17,387
One year through five years, Amortized Cost 7,092 5,368
Five years through ten years, Amortized Cost    
Greater than ten years, Amortized Cost    
Total, Amortized Cost 26,697 22,755
One year or less, Fair Value 19,606 17,392
One year through five years, Fair Value 7,162 5,366
Five years through ten years, Fair Value    
Greater than ten years, Fair Value    
Total, Fair Value $ 26,768 $ 22,758