Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Unrealized Gains (Losses) on Available-For-Sale Securities
Debt securities	$ 1,870,818	$ 2,200,650
Corporate bonds
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	1,416,632	1,689,093
Unrealized Gains	1,287	318
Unrealized Losses	(120)	(1,896)
Debt securities	1,417,799	1,687,515
Other debt securities
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	400,129	464,993
Unrealized Gains	13	7
Unrealized Losses	(17)	(3)
Debt securities	400,125	464,997
Total available-for-sale debt securities
Unrealized Gains (Losses) on Available-For-Sale Securities
Amortized Cost	1,816,761	2,154,086
Unrealized Gains	1,300	325
Unrealized Losses	(137)	(1,899)
Debt securities	$ 1,817,924	$ 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).

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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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