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Investment in Affiliates (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2014
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| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investments in and Advances to Affiliates | At June 30, 2014 and December 31, 2013, the investments in affiliates were composed of the following (in thousands):
(1) CBOE Stock Exchange, LLC ceased trading operations on April 30, 2014. |
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