Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Unrealized Gains (Losses) on Available-for-Sale Securities
Estimated Fair Value	$ 913,150	$ 2,200,650
Corporate bonds
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost	567,926	1,689,093
Unrealized Gains	518	318
Unrealized Losses	(2)	(1,896)
Estimated Fair Value	568,442	1,687,515
Corporate bonds
Unrealized Gains (Losses) on Available-for-Sale Securities
Estimated Fair Value	577,570	1,735,653
Other debt securities
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost	335,572	464,993
Unrealized Gains	8	7
Unrealized Losses	0	(3)
Estimated Fair Value	335,580	464,997
Total available-for-sale debt securities
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost	903,498	2,154,086
Unrealized Gains	526	325
Unrealized Losses	(2)	(1,899)
Estimated Fair Value	$ 904,022	$ 2,152,512

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).

+ References

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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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