Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost		$ 684,943
Unrealized Gains		0
Unrealized Losses		(334)
Estimated Fair Value	$ 2,200,650	684,609
Corporate bonds
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost	1,689,093
Unrealized Gains	318
Unrealized Losses	(1,896)
Estimated Fair Value	1,687,515
Corporate bonds
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost		542,861
Unrealized Gains		0
Unrealized Losses		(288)
Estimated Fair Value	1,735,653	542,573
Other debt securities
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost	464,993	142,082
Unrealized Gains	7	0
Unrealized Losses	(3)	(46)
Estimated Fair Value	464,997	$ 142,036
Total available-for-sale debt securities
Unrealized Gains (Losses) on Available-for-Sale Securities
Amortized cost	2,154,086
Unrealized Gains	325
Unrealized Losses	(1,899)
Estimated Fair Value	$ 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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