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Segregated Cash	9 Months Ended
Segregated Cash	Sep. 30, 2018
Segregated Cash [Abstract]
Segregated Cash	Segregated Cash As of September 30, 2018 and December 31, 2017, cash segregated in compliance with federal regulations and other restricted deposits of $154.2 million and $116.3 million, respectively, consisted of cash deposited in special bank accounts for the benefit of customers under SEC Rule 15c3-3 and cash held in accounts designated as Special Reserve Bank Accounts for Proprietary Accounts of Broker-Dealers ("PAB").