Marketable Investment Securities - Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair value of marketable securities
Cash equivalents (including restricted)	$ 475,648	$ 1,439,494
Total debt securities	1,906,945	904,022
Fair value option - corporate bonds	26,355	9,128
Total debt securities	1,933,300	913,150
Equity securities	18,349	35,566
Total marketable investment securities, including restricted amounts	1,951,649	948,716
Less: Restricted marketable investment securities	(845)	(8,093)
Total marketable investment securities	1,950,804	940,623
Corporate bonds
Fair value of marketable securities
Total debt securities	305,775	568,442
Commercial paper
Fair value of marketable securities
Total debt securities	1,330,726	321,706
Other debt securities
Fair value of marketable securities
Total debt securities	270,444	13,874
Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	49,755	31,451
Total debt securities	268,915	8,093
Fair value option - corporate bonds	0	0
Total debt securities	268,915	8,093
Equity securities	9,767	27,933
Total marketable investment securities, including restricted amounts	278,682	36,026
Less: Restricted marketable investment securities	(845)	(8,093)
Total marketable investment securities	277,837	27,933
Level 1 \| Corporate bonds
Fair value of marketable securities
Total debt securities	0	0
Level 1 \| Commercial paper
Fair value of marketable securities
Total debt securities	0	0
Level 1 \| Other debt securities
Fair value of marketable securities
Total debt securities	268,915	8,093
Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	425,893	1,408,043
Total debt securities	1,638,030	895,929
Fair value option - corporate bonds	26,355	9,128
Total debt securities	1,664,385	905,057
Equity securities	8,582	7,633
Total marketable investment securities, including restricted amounts	1,672,967	912,690
Less: Restricted marketable investment securities	0	0
Total marketable investment securities	1,672,967	912,690
Level 2 \| Corporate bonds
Fair value of marketable securities
Total debt securities	305,775	568,442
Level 2 \| Commercial paper
Fair value of marketable securities
Total debt securities	1,330,726	321,706
Level 2 \| Other debt securities
Fair value of marketable securities
Total debt securities	$ 1,529	$ 5,781

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