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Investment Securities - Investment in TerreStar (Details) - TerreStar Networks Inc. (TerreStar) - Exchangeable Notes - USD ($)
1 Months Ended
Jan. 31, 2016
Dec. 31, 2014
Dec. 31, 2011
Investment disclosures      
Fair value of investments     $ 0
Other, net      
Investment disclosures      
Gain on investments account for at fair value $ 800,000 $ 5,800,000