Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Contractual Maturities (Details)

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Marketable Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Amortized Cost    
Due within one year $ 650,451  
Due after one year through three years 491,751  
Marketable securities, Amortized Cost 1,142,202 $ 1,489,937
Fair Value    
Due within one year 645,992  
Due after one year through three years 484,802  
Marketable securities, Fair value $ 1,130,794 $ 1,475,936