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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, 2018
Dec. 31, 2017
Fair value of marketable securities    
Equity security $ 2,370 $ 93,367
Fair value measurements on recurring basis    
Fair value of marketable securities    
Cash Equivalents (including restricted) 859,220 1,425,798
Total 1,248,490 573,179
Fair value measurements on recurring basis | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 66,823 84,286
Fair value measurements on recurring basis | Commercial paper    
Fair value of marketable securities    
Debt securities 367,488 107,962
Fair value measurements on recurring basis | Corporate securities    
Fair value of marketable securities    
Debt securities 805,259 282,256
Fair value measurements on recurring basis | Other    
Fair value of marketable securities    
Debt securities 6,550 5,308
Fair value measurements on recurring basis | Equity securities    
Fair value of marketable securities    
Equity securities 2,370 93,367
Fair value measurements on recurring basis | Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 30,858 655
Total 69,193 177,653
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 66,823 84,286
Fair value measurements on recurring basis | Level 1 | Equity securities    
Fair value of marketable securities    
Equity securities 2,370 93,367
Fair value measurements on recurring basis | Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 828,362 1,425,143
Total 1,179,104 395,331
Fair value measurements on recurring basis | Level 2 | Commercial paper    
Fair value of marketable securities    
Debt securities 367,488 107,962
Fair value measurements on recurring basis | Level 2 | Corporate securities    
Fair value of marketable securities    
Debt securities 805,259 282,256
Fair value measurements on recurring basis | Level 2 | Other    
Fair value of marketable securities    
Debt securities 6,357 5,113
Fair value measurements on recurring basis | Level 3    
Fair value of marketable securities    
Total 193 195
Fair value measurements on recurring basis | Level 3 | Other    
Fair value of marketable securities    
Debt securities $ 193 $ 195