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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) - Fair value measurements on recurring basis - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair value of marketable securities    
Cash Equivalents (including restricted) $ 5,187,900 $ 920,689
Subtotal 117,295 640,191
Derivative financial instruments   556,828
Total 117,295 1,197,019
US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 81,982 82,124
Corporate securities    
Fair value of marketable securities    
Debt securities 33,555 349,897
Other (including restricted)    
Fair value of marketable securities    
Debt securities 1,758 47,847
Equity securities    
Fair value of marketable securities    
Equity securities   160,323
Level 1    
Fair value of marketable securities    
Cash Equivalents (including restricted) 147,494 82,675
Subtotal 81,982 237,651
Total 81,982 237,651
Level 1 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities 81,982 77,328
Level 1 | Equity securities    
Fair value of marketable securities    
Equity securities   160,323
Level 2    
Fair value of marketable securities    
Cash Equivalents (including restricted) 5,040,406 838,014
Subtotal 28,592 396,177
Derivative financial instruments   556,828
Total 28,592 953,005
Level 2 | US Treasury and agency securities    
Fair value of marketable securities    
Debt securities   4,796
Level 2 | Corporate securities    
Fair value of marketable securities    
Debt securities 27,025 343,733
Level 2 | Other (including restricted)    
Fair value of marketable securities    
Debt securities 1,567 47,648
Level 3    
Fair value of marketable securities    
Subtotal 6,721 6,363
Total 6,721 6,363
Level 3 | Corporate securities    
Fair value of marketable securities    
Debt securities 6,530 6,164
Level 3 | Other (including restricted)    
Fair value of marketable securities    
Debt securities $ 191 $ 199