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Investments (Contractual Maturities of Marketable Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]  
Within One Year $ 433,620
After One, Within Five Years 400,226
After Five, Within Ten Years 0
After Ten Years 0
Total 833,846
Municipal Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 53,012
After One, Within Five Years 196,697
After Five, Within Ten Years 0
After Ten Years 0
Total 249,709
Corporate Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 26,042
After One, Within Five Years 166,018
After Five, Within Ten Years 0
After Ten Years 0
Total 192,060
U.S. Agency Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 8,065
After One, Within Five Years 31,409
After Five, Within Ten Years 0
After Ten Years 0
Total 39,474
Non-U.S. certificates of deposit [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 345,000
After One, Within Five Years 0
After Five, Within Ten Years 0
After Ten Years 0
Total 345,000
Non-U.S. Government Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Within One Year 1,501
After One, Within Five Years 6,102
After Five, Within Ten Years 0
After Ten Years 0
Total $ 7,603