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
Jun. 30, 2014
Dec. 31, 2013
Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost $ 126,496 $ 101,537
One year through five years, Amortized Cost 855,731 609,755
Five years through ten years, Amortized Cost 118,210 157,003
Greater than ten years, Amortized Cost 20,127 29,900
Total, Amortized Cost 1,120,564 898,195
One year or less, Fair Value 127,348 102,126
One year through five years, Fair Value 859,409 610,589
Five years through ten years, Fair Value 116,873 151,221
Greater than ten years, Fair Value 20,683 30,090
Total, Fair Value 1,124,313 894,026
Restricted Deposits [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost 60,665 40,633
One year through five years, Amortized Cost 17,770 6,301
Five years through ten years, Amortized Cost 0 0
Greater than ten years, Amortized Cost 0 0
Total, Amortized Cost 78,435 46,934
One year or less, Fair Value 60,665 40,637
One year through five years, Fair Value 17,777 6,309
Five years through ten years, Fair Value 0 0
Greater than ten years, Fair Value 0 0
Total, Fair Value $ 78,442 $ 46,946