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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 20, 2017	Dec. 31, 2016
Income taxes
Provision for (benefit from) income taxes	$ (6,505)	$ 4,851	$ (2,918)	$ 17,325
Effective tax rate (as a percent)	14.00%	12.80%	16.70%	12.30%
Current income taxes receivable	$ 125,800		$ 125,800			$ 5,800
Deferred tax asset	224,804		224,804			$ 193,859
KCG
Income taxes
Deferred tax asset	31,500		31,500		$ 22,900
Unrecognized tax benefits	$ 8,000		$ 8,000