Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Continuous Unrealized Loss Position (Details)

v3.19.3
Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Investments in continuous loss position, 12 more or more $ 260,400
Fair Value 431,792
Gross Unrealized Losses (426)
Corporate debt securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 182,963
Gross Unrealized Losses (112)
Sovereign securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 1,997
Gross Unrealized Losses (3)
U.S. Government agency securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 79,082
Gross Unrealized Losses (72)
U.S. Treasury securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 167,750
Gross Unrealized Losses $ (239)