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Investment Securities - Schedule of Investments and Investments in Unconsolidated Entities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Marketable investment securities, restricted cash and cash equivalents, and investments in unconsolidated entities      
Total marketable investment securities - current $ 612,338 $ 1,139,103  
Total 625,565 1,150,815  
Long-term Investments [Abstract]      
Cost method 81,174 31,174  
Equity method 128,090 128,788  
Total investments in unconsolidated entities-noncurrent 209,264 159,962  
Total marketable investment securities, restricted cash and cash equivalents, and investments in unconsolidated entities 842,604 1,318,010  
Other-than-temporary impairment loss on marketable investment securities (11,226)    
Restricted cash and marketable investment securities      
Marketable investment securities, restricted cash and cash equivalents, and investments in unconsolidated entities      
Restricted marketable investment securities 13,227 11,712  
Restricted cash and cash equivalents 7,775 7,233  
Corporate Bonds      
Marketable investment securities, restricted cash and cash equivalents, and investments in unconsolidated entities      
Marketable investment securities, at fair value 562,236 1,049,139  
Strategic equity securities      
Marketable investment securities, restricted cash and cash equivalents, and investments in unconsolidated entities      
Marketable investment securities, at fair value 38,864 41,705  
Long-term Investments [Abstract]      
Dividend income from one of the entity's strategic investments 0 0 $ 0
Fair value of trading securities 10,300    
Strategic equity securities | Other-than-temporary impairment on marketable investment securities      
Long-term Investments [Abstract]      
Other-than-temporary impairment loss on marketable investment securities   0 $ 0
Strategic equity securities | Other-than-temporary impairment on marketable investment securities | Common Stock of Company A      
Long-term Investments [Abstract]      
Other-than-temporary impairment of common stock in available-for-sale portfolio 6,100    
Strategic equity securities | Other-than-temporary impairment on marketable investment securities | Common Stock Of Company B      
Long-term Investments [Abstract]      
Other-than-temporary impairment of common stock in available-for-sale portfolio 5,100    
Strategic equity securities | Gains (losses) on marketable investment securities, net      
Long-term Investments [Abstract]      
Unrealized loss on common stock in trading securities portfolio 6,500    
Other      
Marketable investment securities, restricted cash and cash equivalents, and investments in unconsolidated entities      
Marketable investment securities, at fair value $ 11,238 $ 48,259