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)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
USD ($)
Investments in an Unrealized Loss Position  
Fair Value $ 436,747
Gross Unrealized Losses, less than 12 months $ (651) [1]
Continuous loss position not exceeding this period 12 months
U.S. Treasury securities  
Investments in an Unrealized Loss Position  
Fair Value $ 10,412
Gross Unrealized Losses, less than 12 months (1) [1]
U.S. Government agency securities  
Investments in an Unrealized Loss Position  
Fair Value 55,314
Gross Unrealized Losses, less than 12 months (55) [1]
Municipal securities  
Investments in an Unrealized Loss Position  
Fair Value 2,655
Gross Unrealized Losses, less than 12 months 0 [1]
Corporate debt securities  
Investments in an Unrealized Loss Position  
Fair Value 345,648
Gross Unrealized Losses, less than 12 months (585) [1]
Sovereign securities  
Investments in an Unrealized Loss Position  
Fair Value 22,718
Gross Unrealized Losses, less than 12 months $ (10) [1]
[1] As of September 30, 2015, 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.