Annual report pursuant to Section 13 and 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
Dec. 31, 2013
Dec. 31, 2012
Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost $ 101,537 $ 136,997
One year through five years, Amortized Cost 609,755 429,053
Five years through ten years, Amortized Cost 157,003 93,907
Greater than ten years, Amortized Cost 29,900 24,599
Total, Amortized Cost 898,195 684,556
One year or less, Fair Value 102,126 138,101
One year through five years, Fair Value 610,589 435,728
Five years through ten years, Fair Value 151,221 93,778
Greater than ten years, Fair Value 30,090 25,264
Total, Fair Value 894,026 692,871
Restricted Deposits [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost 40,633 33,897
One year through five years, Amortized Cost 6,301 358
Five years through ten years, Amortized Cost 0 0
Greater than ten years, Amortized Cost 0 0
Total, Amortized Cost 46,934 34,255
One year or less, Fair Value 40,637 33,928
One year through five years, Fair Value 6,309 358
Five years through ten years, Fair Value 0 0
Greater than ten years, Fair Value 0 0
Total, Fair Value $ 46,946 $ 34,286