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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
Jun. 30, 2018
Dec. 31, 2017
Fair value of marketable securities    
Debt securities $ 547,615 $ 479,812
Equity security 71,943 93,367
US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 72,301 84,286
Commercial paper    
Fair value of marketable securities    
Debt securities 50,000 107,962
Corporate securities    
Fair value of marketable securities    
Debt securities 423,253 282,256
Other    
Fair value of marketable securities    
Debt securities 2,061 5,308
Fair value measurements on recurring basis    
Fair value of marketable securities    
Cash Equivalents (including restricted) 969,510 1,425,798
Equity security 71,943 93,367
Total 619,558 573,179
Fair value measurements on recurring basis | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 72,301 84,286
Fair value measurements on recurring basis | Commercial paper    
Fair value of marketable securities    
Debt securities 50,000 107,962
Fair value measurements on recurring basis | Corporate securities    
Fair value of marketable securities    
Debt securities 423,253 282,256
Fair value measurements on recurring basis | Other    
Fair value of marketable securities    
Debt securities 2,061 5,308
Fair value measurements on recurring basis | Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 2,794 655
Equity security 71,943 93,367
Total 144,244 177,653
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 72,301 84,286
Fair value measurements on recurring basis | Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 966,716 1,425,143
Total 475,118 395,331
Fair value measurements on recurring basis | Level 2 | Commercial paper    
Fair value of marketable securities    
Debt securities 50,000 107,962
Fair value measurements on recurring basis | Level 2 | Corporate securities    
Fair value of marketable securities    
Debt securities 423,253 282,256
Fair value measurements on recurring basis | Level 2 | Other    
Fair value of marketable securities    
Debt securities 1,865 5,113
Fair value measurements on recurring basis | Level 3    
Fair value of marketable securities    
Total 196 195
Fair value measurements on recurring basis | Level 3 | Other    
Fair value of marketable securities    
Debt securities $ 196 $ 195