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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair value of marketable investment securities in a loss position    
Total $ 1,336,236 $ 2,040,282
Unrealized loss on marketable investment securities in a loss position    
Total (850) (3,355)
Debt Securities
   
Fair value of marketable investment securities in a loss position    
Less than 12 Months 1,302,801 2,002,239
12 Months or More 33,435 38,043
Unrealized loss on marketable investment securities in a loss position    
Less than 12 months (786) (2,820)
12 months or More $ (64) $ (535)