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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
Sep. 30, 2017
Dec. 31, 2016
Fair value of marketable securities    
Debt securities $ 291,862 $ 117,295
Strategic - trading 47,856  
US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 86,029 81,982
Commercial paper    
Fair value of marketable securities    
Debt securities 27,843  
Corporate securities    
Fair value of marketable securities    
Debt securities 175,393 33,555
Other (including restricted)    
Fair value of marketable securities    
Debt securities 2,597 1,758
Fair value measurements on recurring basis    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,482,786 5,187,900
Strategic - trading 47,856  
Total 339,718 117,295
Fair value measurements on recurring basis | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 86,029 81,982
Fair value measurements on recurring basis | Commercial paper    
Fair value of marketable securities    
Debt securities 27,843  
Fair value measurements on recurring basis | Corporate securities    
Fair value of marketable securities    
Debt securities 175,393 33,555
Fair value measurements on recurring basis | Other (including restricted)    
Fair value of marketable securities    
Debt securities 2,597 1,758
Fair value measurements on recurring basis | Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 105,818 147,494
Strategic - trading 47,856  
Total 133,885 81,982
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 86,029 81,982
Fair value measurements on recurring basis | Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,376,968 5,040,406
Total 192,644 28,592
Fair value measurements on recurring basis | Level 2 | Commercial paper    
Fair value of marketable securities    
Debt securities 27,843  
Fair value measurements on recurring basis | Level 2 | Corporate securities    
Fair value of marketable securities    
Debt securities 162,390 27,025
Fair value measurements on recurring basis | Level 2 | Other (including restricted)    
Fair value of marketable securities    
Debt securities 2,411 1,567
Fair value measurements on recurring basis | Level 3    
Fair value of marketable securities    
Total 13,189 6,721
Fair value measurements on recurring basis | Level 3 | Corporate securities    
Fair value of marketable securities    
Debt securities 13,003 6,530
Fair value measurements on recurring basis | Level 3 | Other (including restricted)    
Fair value of marketable securities    
Debt securities $ 186 $ 191