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Business Developments, Acquisition and Transition Costs, Special Charges and Intangible Asset Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Asset Acquisition, Contingent Consideration, Liability	$ 4,463		$ 4,463
Asset Acquisition, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	2,938		3,971
Acquisition and Transition Costs	0	$ 599	21	$ 976
Special Charges	1,967	0	3,864	21,507
Investment Banking [Member]
Business Acquisition [Line Items]
Acquisition and Transition Costs	0	107	0	107
Special Charges	1,967	0	3,864	14,400
Amortization of Intangible Assets	2,191	2,357	6,571	7,071
Investment Management [Member]
Business Acquisition [Line Items]
Acquisition and Transition Costs	0	492	21	869
Special Charges	0	0	0	7,107
Amortization of Intangible Assets	$ 110	$ 118	328	354
Special Charges [Member] | G5 [Member] | Investment Banking [Member]
Business Acquisition [Line Items]
Equity Method Investment, Other than Temporary Impairment				14,400
Institutional Asset Management [Member] | Special Charges [Member] | Investment Management [Member]
Business Acquisition [Line Items]
Goodwill, Impairment Loss				$ 7,107
PCA [Member]
Business Acquisition [Line Items]
Issuance of Noncontrolling Interest			$ 770

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Asset Acquisition Contingent Consideration Arrangements Change In Amounts Of Contingent Consideration Liability

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Asset Acquisition Contingent Consideration Liability

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Special Charges incurred related to the impairment of intangible assets, Special Charges incurred in connection with exiting facilities and Special Charges related to acquisitions, including the exiting of facilities for office space, introducing fees as well as other professional fees

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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