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, 2013
Dec. 31, 2012
Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost $ 121,753 $ 138,011
One year through five years, Amortized Cost 588,145 474,068
Five years through ten years, Amortized Cost 169,250 94,006
Greater than ten years, Amortized Cost 62,891 38,799
Total, Amortized Cost 942,039 744,884
One year or less, Fair Value 122,631 139,118
One year through five years, Fair Value 589,585 481,381
Five years through ten years, Fair Value 164,201 93,878
Greater than ten years, Fair Value 63,124 39,464
Total, Fair Value 939,541 753,841
Restricted Deposits [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost 36,600 34,403
One year through five years, Amortized Cost 4,302 358
Five years through ten years, Amortized Cost 0 0
Greater than ten years, Amortized Cost 0 0
Total, Amortized Cost 40,902 34,761
One year or less, Fair Value 36,606 34,435
One year through five years, Fair Value 4,305 358
Five years through ten years, Fair Value 0 0
Greater than ten years, Fair Value 0 0
Total, Fair Value $ 40,911 $ 34,793