Marketable Investment Securities - Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair value of marketable securities
Total debt securities	$ 471,125	$ 904,022
Fair value option - corporate bonds	12,038	9,128
Total debt securities	483,163	913,150
Equity securities	27,548	35,566
Total marketable investment securities, including restricted amounts	510,711	948,716
Less: Restricted marketable investment securities	(731)	(8,093)
Total marketable investment securities	509,980	940,623
Corporate bonds
Fair value of marketable securities
Total debt securities	381,201	568,442
Other debt securities
Fair value of marketable securities
Total debt securities	89,924	335,580
Level 1
Fair value of marketable securities
Total debt securities	731	8,093
Fair value option - corporate bonds	0	0
Total debt securities	731	8,093
Equity securities	19,872	27,933
Total marketable investment securities, including restricted amounts	20,603	36,026
Less: Restricted marketable investment securities	(731)	(8,093)
Total marketable investment securities	19,872	27,933
Level 1 \| Corporate bonds
Fair value of marketable securities
Total debt securities	0	0
Level 1 \| Other debt securities
Fair value of marketable securities
Total debt securities	731	8,093
Level 2
Fair value of marketable securities
Total debt securities	470,394	895,929
Fair value option - corporate bonds	12,038	9,128
Total debt securities	482,432	905,057
Equity securities	7,676	7,633
Total marketable investment securities, including restricted amounts	490,108	912,690
Less: Restricted marketable investment securities	0	0
Total marketable investment securities	490,108	912,690
Level 2 \| Corporate bonds
Fair value of marketable securities
Total debt securities	381,201	568,442
Level 2 \| Other debt securities
Fair value of marketable securities
Total debt securities	$ 89,193	$ 327,487

Debt Securities, Available-for-sale, Fair Value Option

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Debt Securities, Available-for-sale, Including Fair Value Option

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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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Amount of restricted 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 equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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