Quarterly report pursuant to Section 13 or 15(d)

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

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Short-Term And Long-Term Investments And Restricted Deposits (Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost $ 138,508 $ 129,232
One year through five years, Amortized Cost 423,533 406,140
Five years through ten years, Amortized Cost 37,331 34,945
Greater than ten years, Amortized Cost 88,860 56,720
Total, Amortized Cost 688,232 627,037
One year or less, Fair Value 139,920 130,499
One year through five years, Fair Value 432,717 413,953
Five years through ten years, Fair Value 37,444 34,961
Greater than ten years, Fair Value 89,553 57,226
Total, Fair Value 699,634 636,639
Restricted Deposits [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost 33,108 19,666
One year through five years, Amortized Cost 358 7,085
Five years through ten years, Amortized Cost 0 0
Greater than ten years, Amortized Cost 0 0
Total, Amortized Cost 33,466 26,751
One year or less, Fair Value 33,151 19,666
One year through five years, Fair Value 358 7,152
Five years through ten years, Fair Value 0 0
Greater than ten years, Fair Value 0 0
Total, Fair Value $ 33,509 $ 26,818