v3.20.2
Investments - Maturities of Available-for-Sale Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]    
Due within 1 year $ 1,505,362  
Due in 1 year through 5 years 776,807  
Total $ 2,282,169 $ 1,928,649