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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair value of marketable investment securities in a loss position    
Total $ 1,450,836 $ 2,293,845
Unrealized loss on marketable investment securities in a loss position    
Total (4,090) (9,879)
Debt securities
   
Fair value of marketable investment securities in a loss position    
Less than 12 Months 1,382,273 2,208,930
12 Months or More 68,563 84,915
Unrealized loss on marketable investment securities in a loss position    
Less than 12 Months (834) (3,106)
12 Months or More $ (3,256) $ (6,773)