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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, 2017
Dec. 31, 2016
Fair value of marketable securities    
Strategic - trading $ 93,367  
Fair value measurements on recurring basis    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,425,798 $ 5,187,900
Total 573,179 117,295
Fair value measurements on recurring basis | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 84,286 81,982
Fair value measurements on recurring basis | Commercial paper    
Fair value of marketable securities    
Debt securities 107,962  
Fair value measurements on recurring basis | Corporate securities    
Fair value of marketable securities    
Debt securities 282,256 33,555
Fair value measurements on recurring basis | Other    
Fair value of marketable securities    
Debt securities 5,308 1,758
Fair value measurements on recurring basis | Equity securities    
Fair value of marketable securities    
Equity securities 93,367  
Fair value measurements on recurring basis | Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 655 147,494
Total 177,653 81,982
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 84,286 81,982
Fair value measurements on recurring basis | Level 1 | Equity securities    
Fair value of marketable securities    
Equity securities 93,367  
Fair value measurements on recurring basis | Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,425,143 5,040,406
Total 395,331 28,592
Fair value measurements on recurring basis | Level 2 | Commercial paper    
Fair value of marketable securities    
Debt securities 107,962  
Fair value measurements on recurring basis | Level 2 | Corporate securities    
Fair value of marketable securities    
Debt securities 282,256 27,025
Fair value measurements on recurring basis | Level 2 | Other    
Fair value of marketable securities    
Debt securities 5,113 1,567
Fair value measurements on recurring basis | Level 3    
Fair value of marketable securities    
Total 195 6,721
Fair value measurements on recurring basis | Level 3 | Corporate securities    
Fair value of marketable securities    
Debt securities   6,530
Fair value measurements on recurring basis | Level 3 | Other    
Fair value of marketable securities    
Debt securities $ 195 $ 191