Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 259,148	$ 130,052
Cash collateral pledged	6,318	17,888
Segregated cash	176,647	116,268
Securities owned, at fair value	520,888	673,221
Receivable on derivative contracts, at fair value	25,125	69,177
Securities Borrowed, Gross	407,795	443,148
Other investments	181,407	141,548
Deposits with clearing organizations, brokers and banks	89,423	93,996
Receivable from brokers, dealers and clearing organizations	786,113	508,178
Receivable from customers, net of allowance of $516 and $1,550, respectively	37,858	49,891
Fees receivable, net of allowance of $1,569 and $1,736, respectively	111,946	111,784
Due from related parties	33,870	34,814
Fixed assets, net of accumulated depreciation and amortization of $31,630 and $28,355, respectively	26,443	40,496
Goodwill	60,678	60,678
Intangible assets, net of accumulated amortization of $38,093 and $33,081, respectively	24,943	29,955
Deferred tax asset, net	93,057	116,323
Other assets	79,014	88,268
Consolidated Funds
Cash and cash equivalents, Consolidated Funds	38,118	21,988
Securities owned, at fair value	187,633	165,916
Receivable on derivative contracts, at fair value	4,416	2,520
Other Investments, Consolidated Funds	186,395	374,111
Receivable from brokers, Consolidated Funds	8,328	5,644
Other assets, Consolidated Funds	740	388
Total Assets	3,346,303	3,296,252
Liabilities
Securities sold, not yet purchased, at fair value	195,307	342,527
Payable for derivative contracts, at fair value	16,082	42,750
Securities Loaned, Gross	414,852	456,831
Payables to brokers, dealers and clearing organizations	228,731	252,153
Payable to customers	525,153	352,467
Commission management payable	95,270	70,451
Compensation payable	223,994	150,206
Notes payable and other debt	262,965	173,458
Convertible debt	134,489	141,502
Fees payable	22,565	8,047
Due to related parties	571	570
Accounts payable, accrued expenses and other liabilities	110,423	96,533
Consolidated Funds
Payable for derivative contracts, at fair value	1,663	7,130
Payable to brokers	23,521	751
Capital withdrawals payable	11,106	11,931
Accounts payable, accrued expenses and other liabilities	424	322
Total Liabilities	2,267,116	2,107,629
Commitments and Contingencies
Redeemable non-controlling interests	284,780	440,604
Stockholders' equity
Additional paid-in capital	1,062,877	1,004,664
(Accumulated deficit) retained earnings	(34,648)	(70,116)
Accumulated other comprehensive income (loss)	(5)	(8)
Less: Class A common stock held in treasury, at cost, 15,336,871 and 12,133,276 shares as of December 31, 2018 and December 31, 2017, respectively.	(234,142)	(186,846)
Total Stockholders' Equity	794,407	748,019
Total Liabilities and Stockholders' Equity	3,346,303	3,296,252
Convertible Preferred Stock
Stockholders' equity
Preferred stock	1	1
Common Stock Class A
Stockholders' equity
Common stock	324	324
Less: Class A common stock held in treasury, at cost, 15,336,871 and 12,133,276 shares as of December 31, 2018 and December 31, 2017, respectively.	(234,142)	(186,846)
Common Stock Class B
Stockholders' equity
Common stock	$ 0	$ 0