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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Changes in Estimated Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair value of marketable investment securities in a loss position    
Total $ 66,780 $ 316,839
Unrealized loss on marketable investment securities in a loss position    
Total (39) (673)
Debt securities    
Fair value of marketable investment securities in a loss position    
Less than 12 Months 66,653 303,194
12 Months or More 127 7,512
Unrealized loss on marketable investment securities in a loss position    
Less than 12 Months (28) (612)
12 Months or More $ (11) (20)
Equity securities    
Fair value of marketable investment securities in a loss position    
Less than 12 Months   6,133
Unrealized loss on marketable investment securities in a loss position    
Less than 12 Months   $ (41)