Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt securities	$ 471,125	$ 904,022
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	381,071	567,926
Unrealized Gains	132	518
Unrealized Losses	(2)	(2)
Debt securities	381,201	568,442
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	89,923	335,572
Unrealized Gains	1	8
Unrealized Losses	0	0
Debt securities	89,924	335,580
Total available-for-sale debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	470,994	903,498
Unrealized Gains	133	526
Unrealized Losses	(2)	(2)
Debt securities	$ 471,125	$ 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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