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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair value of marketable investment securities in a loss position    
Total $ 2,293,845 $ 988,512
Unrealized loss on marketable investment securities in a loss position    
Total (9,879) (20,773)
Debt securities
   
Fair value of marketable investment securities in a loss position    
Less than 12 Months 2,208,930 761,551
12 Months or More 84,915 72,395
Unrealized loss on marketable investment securities in a loss position    
Less than 12 Months (3,106) (909)
12 Months or More (6,773) (8,327)
Equity securities
   
Fair value of marketable investment securities in a loss position    
Less than 12 Months   154,566
Unrealized loss on marketable investment securities in a loss position    
Less than 12 Months   $ (11,537)