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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
Mar. 31, 2018
Dec. 31, 2017
Fair value of marketable securities    
Debt securities $ 179,867 $ 479,812
Equity security 56,078 93,367
US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 71,866 84,286
Commercial paper    
Fair value of marketable securities    
Debt securities   107,962
Corporate securities    
Fair value of marketable securities    
Debt securities 105,074 282,256
Other    
Fair value of marketable securities    
Debt securities 2,927 5,308
Fair value measurements on recurring basis    
Fair value of marketable securities    
Cash Equivalents (including restricted) 2,012,886 1,425,798
Equity security 56,078 93,367
Total 235,945 573,179
Fair value measurements on recurring basis | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 71,866 84,286
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 105,074 282,256
Fair value measurements on recurring basis | Other    
Fair value of marketable securities    
Debt securities 2,927 5,308
Fair value measurements on recurring basis | Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,226,608 655
Equity security 56,078 93,367
Total 127,944 177,653
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 71,866 84,286
Fair value measurements on recurring basis | Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 786,278 1,425,143
Total 107,806 395,331
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 105,074 282,256
Fair value measurements on recurring basis | Level 2 | Other    
Fair value of marketable securities    
Debt securities 2,732 5,113
Fair value measurements on recurring basis | Level 3    
Fair value of marketable securities    
Total 195 195
Fair value measurements on recurring basis | Level 3 | Other    
Fair value of marketable securities    
Debt securities $ 195 $ 195