Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt securities	$ 1,906,945	$ 904,022
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	305,628	567,926
Unrealized Gains	152	518
Unrealized Losses	(5)	(2)
Debt securities	305,775	568,442
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,330,726	321,705
Unrealized Gains	0	1
Unrealized Losses	0	0
Debt securities	1,330,726	321,706
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	270,433	13,867
Unrealized Gains	11	7
Unrealized Losses	0	0
Debt securities	270,444	13,874
Total available-for-sale debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,906,787	903,498
Unrealized Gains	163	526
Unrealized Losses	(5)	(2)
Debt securities	$ 1,906,945	$ 904,022

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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