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Investment in Affiliates (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investments in Affiliates $ 14,174 $ 14,270
Investment in OCC [Member]
   
Investments in Affiliates 333 333
Investment in Signal Trading [Member]
   
Investments in Affiliates 11,341 11,437
Investment in IPXI [Member]
   
Investments in Affiliates 2,500 2,500
Investment in CBSX [Member] [Member]
   
Investments in Affiliates $ 0 $ 0