Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt securities	$ 750,218		$ 904,022
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	449,483		567,926
Unrealized Gains	0		518
Unrealized Losses	(2,968)		(2)
Debt securities	446,515		568,442
Gains (losses) on investments, net	(4,208)	$ 4,198
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	303,694		335,572
Unrealized Gains	9		8
Unrealized Losses	0		0
Debt securities	303,703		335,580
Total available-for-sale debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	753,177		903,498
Unrealized Gains	9		526
Unrealized Losses	(2,968)		(2)
Debt securities	$ 750,218		$ 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).

+ 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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