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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Investments Measured at Fair Value On A Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jul. 01, 2020
Dec. 31, 2019
Fair value of marketable securities      
Marketable Investment Securities $ 387,420   $ 417,094
Fair value of derivative 691,000    
US Treasury and agency securities      
Fair value of marketable securities      
Marketable Investment Securities 65,992   10,016
Commercial paper      
Fair value of marketable securities      
Marketable Investment Securities 298,435   369,397
Corporate securities      
Fair value of marketable securities      
Marketable Investment Securities 22,552   28,796
Other      
Fair value of marketable securities      
Marketable Investment Securities 441   8,885
Fair value measurements on recurring basis      
Fair value of marketable securities      
Cash Equivalents (including restricted) 3,330,296   2,436,545
Total 387,420   417,094
Fair value measurements on recurring basis | US Treasury and agency securities      
Fair value of marketable securities      
Total 65,992   10,016
Fair value measurements on recurring basis | Commercial paper      
Fair value of marketable securities      
Total 298,435   369,397
Fair value measurements on recurring basis | Corporate securities      
Fair value of marketable securities      
Total 22,552   28,796
Fair value measurements on recurring basis | Other      
Fair value of marketable securities      
Total 441   8,885
Fair value measurements on recurring basis | Level 1      
Fair value of marketable securities      
Cash Equivalents (including restricted) 363,123   246,876
Total 65,992   10,016
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities      
Fair value of marketable securities      
Total 65,992   10,016
Fair value measurements on recurring basis | Level 2      
Fair value of marketable securities      
Cash Equivalents (including restricted) 2,967,173   2,189,669
Total 321,233   406,882
Fair value measurements on recurring basis | Level 2 | Commercial paper      
Fair value of marketable securities      
Total 298,435   369,397
Fair value measurements on recurring basis | Level 2 | Corporate securities      
Fair value of marketable securities      
Total 22,552   28,796
Fair value measurements on recurring basis | Level 2 | Other      
Fair value of marketable securities      
Total 246   8,689
Fair value measurements on recurring basis | Level 3      
Fair value of marketable securities      
Total 195   196
Fair value measurements on recurring basis | Level 3 | Other      
Fair value of marketable securities      
Total 195   $ 196
Boost Mobile Aquisition [Member]      
Fair value of marketable securities      
Spectrum purchase option fair value $ 713,000 $ 713,000