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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 4, 2016, KCGA entered into an asset purchase agreement with Citadel Securities LLC (“Citadel”), pursuant to which KCGA agreed to sell its NYSE DMM business to Citadel. The transaction is expected to close during the second quarter of 2016. Subsequent to the year ended December 31, 2015, the Company repurchased in the open market $35.0 million par value of its 6.875% Senior Secured Notes.