Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Continuous Unrealized Loss Position (Details)

v3.6.0.2
Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Investments in an Unrealized Loss Position  
Fair Value $ 1,230,263
Gross Unrealized Losses, less than 12 months (6,235) [1]
Corporate debt securities  
Investments in an Unrealized Loss Position  
Fair Value 702,366
Gross Unrealized Losses, less than 12 months (2,969) [1]
U.S. Government agency securities  
Investments in an Unrealized Loss Position  
Fair Value 310,258
Gross Unrealized Losses, less than 12 months (1,957) [1]
U.S. Treasury securities  
Investments in an Unrealized Loss Position  
Fair Value 173,202
Gross Unrealized Losses, less than 12 months (1,203) [1]
Sovereign securities  
Investments in an Unrealized Loss Position  
Fair Value 43,433
Gross Unrealized Losses, less than 12 months (106) [1]
Municipal securities  
Investments in an Unrealized Loss Position  
Fair Value 1,004
Gross Unrealized Losses, less than 12 months $ 0 [1]
[1] As of December 31, 2016, 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.