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Investment Securities - Marketable Investment Securities in a Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair value of marketable investment securities in a loss position    
Less than 12 months $ 364,160 $ 968,941
12 months or more 149,889  
Total 514,049 968,941
Unrealized losses on marketable investment securities in a loss position    
Less than 12 months (609) (4,929)
12 months or more (126)  
Total $ (735) $ (4,929)