Annual report pursuant to Section 13 and 15(d)

Marketable Securities - Contractual Maturities of Securities (Details)

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Marketable Securities - Contractual Maturities of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Amortized Cost    
Due within one year $ 750,665  
Due after one year through three years 739,272  
Marketable securities, Amortized Cost 1,489,937 $ 1,868,187
Fair Value    
Due within one year 746,978  
Due after one year through three years 728,958  
Marketable securities, Fair Value $ 1,475,936 $ 1,863,689