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Sale of BondPoint (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of BondPoint		$ 400,192	$ 0
Assets and liabilities of businesses held for sale
Goodwill adjustment allocated to BondPoint		8,300
Gain on sale of BondPoint, net of transaction costs		$ 329,703	$ 0
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of BondPoint	$ 400,192
Professional fees	7,100
Compensation	1,400
Assets and liabilities of businesses held for sale
Goodwill adjustment allocated to BondPoint	8,300
Gain on sale of BondPoint	337,550
Transaction costs	8,568
Gain on sale of BondPoint, net of transaction costs	$ 328,982
BondPoint | Held for Sale
Assets and liabilities of businesses held for sale
Receivables from broker dealers and clearing organizations				$ 3,383
Intangibles and other assets				51,687
Liabilities				(728)
Total carrying value of BondPoint as of December 31, 2017:				$ 54,342

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