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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, 2019
Dec. 31, 2018
Fair value of marketable securities    
Debt securities $ 872,878 $ 1,246,120
Equity security 2,894 2,370
US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 59,155 66,823
Commercial paper    
Fair value of marketable securities    
Debt securities 383,420 367,488
Corporate securities    
Fair value of marketable securities    
Debt securities 424,221 805,259
Other    
Fair value of marketable securities    
Debt securities 6,082 6,550
Fair value measurements on recurring basis    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,540,361 859,220
Equity security 2,894 2,370
Total 875,772 1,248,490
Fair value measurements on recurring basis | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 59,155 66,823
Fair value measurements on recurring basis | Commercial paper    
Fair value of marketable securities    
Debt securities 383,420 367,488
Fair value measurements on recurring basis | Corporate securities    
Fair value of marketable securities    
Debt securities 424,221 805,259
Fair value measurements on recurring basis | Other    
Fair value of marketable securities    
Debt securities 6,082 6,550
Fair value measurements on recurring basis | Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 261,843 30,858
Equity security 2,894 2,370
Total 62,049 69,193
Fair value measurements on recurring basis | Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 59,155 66,823
Fair value measurements on recurring basis | Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 1,278,518 828,362
Total 813,538 1,179,104
Fair value measurements on recurring basis | Level 2 | Commercial paper    
Fair value of marketable securities    
Debt securities 383,420 367,488
Fair value measurements on recurring basis | Level 2 | Corporate securities    
Fair value of marketable securities    
Debt securities 424,221 805,259
Fair value measurements on recurring basis | Level 2 | Other    
Fair value of marketable securities    
Debt securities 5,897 6,357
Fair value measurements on recurring basis | Level 3    
Fair value of marketable securities    
Total 185 193
Fair value measurements on recurring basis | Level 3 | Other    
Fair value of marketable securities    
Debt securities $ 185 $ 193