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ITG Acquisition - Tax Treatment of the ITG Acquisition (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Deferred tax assets	$ 215,063		$ 200,359
ITG
Business Acquisition [Line Items]
Deferred tax assets		$ 17,200
Deferred tax liabilities		$ 65,900

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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