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Special Charges and Intangible Asset Amortization	3 Months Ended
Special Charges and Intangible Asset Amortization	Mar. 31, 2019
Business Combinations [Abstract]
Acquisition and Transition Costs and Special Charges [Text Block]	Special Charges and Intangible Asset Amortization Special Charges The Company recognized $1,029 for the three months ended March 31, 2019, as Special Charges incurred related to the acceleration of depreciation expense for leasehold improvements in conjunction with the previously announced expansion of the Company's headquarters in New York. The Company recognized $1,897 for the three months ended March 31, 2018 as Special Charges incurred related 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 for the three months ended March 31, 2019 and 2018, 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 $110 and $109 for the three months ended March 31, 2019 and 2018, respectively, included within Depreciation and Amortization expense on the Unaudited Condensed Consolidated Statements of Operations.