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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Components of our available-for-sale investments    
Debt securities $ 401,261 $ 2,131,745
Total marketable investment securities 483,056 2,208,715
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 129,802 181,189
Unrealized Losses (93) (4,510)
Unrealized Gains Losses, Net 129,709 176,679
Contractual maturities of restricted and non-restricted marketable investment securities    
Debt securities with contractual maturities within one year 134,000  
Debt securities with contractual maturities extending longer than one year through and including five years 60,000  
Debt securities with contractual maturities longer than ten years 101,000  
Accumulated net unrealized gains (losses)    
Accumulated net unrealized gains, before tax, in accumulated other comprehensive income (loss) 130,000 177,000
Accumulated net unrealized gains, net of tax, in accumulated other comprehensive income (loss) 82,000 175,000
US Treasury and agency securities    
Components of our available-for-sale investments    
Debt securities 56,754 58,254
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 66 7
Unrealized Losses (1) (11)
Unrealized Gains Losses, Net 65 (4)
Commercial paper    
Components of our available-for-sale investments    
Debt securities 11,792 68,556
Corporate securities    
Components of our available-for-sale investments    
Debt securities 169,526 1,496,044
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 39,856 72,918
Unrealized Losses (78) (153)
Unrealized Gains Losses, Net 39,778 72,765
Other (including restricted)    
Components of our available-for-sale investments    
Debt securities 57,330 192,607
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 81 1,293
Unrealized Losses (14)  
Unrealized Gains Losses, Net 67 1,293
Equity securities    
Components of our available-for-sale investments    
Equity securities 187,654 393,254
Unrealized Gains (Losses) on Marketable Investment Securities    
Unrealized Gains 89,799 106,971
Unrealized Losses   (4,346)
Unrealized Gains Losses, Net $ 89,799 $ 102,625