Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Cash flows from operating activities
Financial Designation, Predecessor and Successor [Fixed List]		Predecessor
Net income	$ 115,746	$ 130,160
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	102,928	48,808
Contingent consideration		26,830
Vesting of P-1('C) Shares		(5,728)
Share-based compensation expense	41,092
Deferred taxes	(9,018)	2,602
(Increase) decrease in operating assets:
Receivable from brokers and dealers and clearing organizations	(573,069)	(318)
Deposits with clearing organizations	(679)	726
Accounts receivable	(9,421)	(28,434)
Receivable from affiliates	(271)	(2,534)
Other assets	(8,241)	(6,371)
Increase (decrease) in operating liabilities:
Securities sold under agreements to repurchase	24,938
Payable to brokers and dealers and clearing organizations	541,806	(4,322)
Accrued compensation	(25,142)	(7,568)
Deferred revenue	682	(1,396)
Accounts payable, accrued expenses and other liabilities	6,609	8,793
Employee equity compensation payable	(16,746)	2,896
Payable to affiliates	(749)	684
Net cash provided by operating activities	190,465	164,828
Cash flows from investing activities
Purchase of furniture, equipment, software and leasehold improvements	(8,567)	(6,327)
Capitalized software development costs	(21,200)	(19,523)
Net cash (used in) investing activities	(29,767)	(25,850)
Cash flows from financing activities
Pre-IPO capital distributions	(120,000)	(139,350)
Proceeds from issuance of Class A common stock in the IPO, net of underwriting discounts	1,161,270
Purchase of LLC Interests	(1,161,270)
Offering costs from issuance of Class A common stock in the IPO	(12,306)
Dividends	(22,869)
Capital distributions to non-controlling interests	(23,681)
Net cash (used in) financing activities	(178,856)	(139,350)
Effect of exchange rate changes on cash and cash equivalents	(2,016)	(2,043)
Net decrease in cash and cash equivalents	(20,174)	(2,415)
Cash and cash equivalents and restricted cash
Beginning of period	411,304	353,798
End of period	391,130	351,383
Supplemental disclosure of cash flow information
Income taxes paid	30,287	5,500
Non-cash financing activities - terms arising from the reorganization transactions and IPO
Deferred tax asset	103,153
Refinitiv Transaction
Adjustments to reconcile net income to net cash used in operating activities:
Deferred taxes	93,194
Non-cash financing activities - terms arising from the reorganization transactions and IPO
Establishment of liabilities under tax receivable agreement	$ 171,426
Vesting of contingent consideration		$ 150,495