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Special Charges and Intangible Asset Amortization	3 Months Ended
Special Charges and Intangible Asset Amortization	Mar. 31, 2018
Business Combinations [Abstract]
Acquisition and Transition Costs and Special Charges	Special Charges and Intangible Asset Amortization Special Charges The Company recognized $1,897 for the three months ended March 31, 2018, as Special Charges incurred related to separation benefits and costs for the termination of certain contracts associated with closing the Company's agency trading platform in the U.K. Intangible Asset Amortization Expense associated with the amortization of intangible assets for Investment Banking was $2,190 and $2,357 for the three months ended March 31, 2018 and 2017, respectively, included within Depreciation and Amortization expense on the Unaudited Condensed Consolidated Statements of Operations. Expense associated with the amortization of intangible assets for Investment Management was $109 and $118 for the three months ended March 31, 2018 and 2017, respectively, included within Depreciation and Amortization expense on the Unaudited Condensed Consolidated Statements of Operations.