Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Continuous Unrealized Loss Position) (Details)

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Marketable Securities (Continuous Unrealized Loss Position) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Sep. 30, 2014
Investments in an Unrealized Loss Position  
Fair Value $ 1,080,623
Gross Unrealized Losses, less than 12 months (1,773) [1]
Continuous loss position not exceeding this period 12 months
U.S. Treasury securities
  
Investments in an Unrealized Loss Position  
Fair Value 169,353
Gross Unrealized Losses, less than 12 months (140) [1]
U.S. Government agency securities
  
Investments in an Unrealized Loss Position  
Fair Value 449,673
Gross Unrealized Losses, less than 12 months (708) [1]
Municipal securities
  
Investments in an Unrealized Loss Position  
Fair Value 32,441
Gross Unrealized Losses, less than 12 months (66) [1]
Corporate debt securities
  
Investments in an Unrealized Loss Position  
Fair Value 400,740
Gross Unrealized Losses, less than 12 months (840) [1]
Sovereign securities
  
Investments in an Unrealized Loss Position  
Fair Value 28,416
Gross Unrealized Losses, less than 12 months $ (19) [1]
[1] Of the total gross unrealized losses, the amount of total gross unrealized losses related to investments that had been in a continuous loss position for 12 months or more was immaterial.