Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 117,680	$ 130,052
Cash collateral pledged	14,786	17,888
Segregated cash	131,444	116,268
Securities owned, at fair value	543,740	673,221
Receivable on derivative contracts, at fair value	34,913	69,177
Securities borrowed	598,090	443,148
Other investments	157,293	141,548
Deposits with clearing organizations, brokers and banks	101,399	93,996
Receivable from brokers, dealers and clearing organizations	562,341	508,178
Receivables from customers, net of allowance of $570 and $1,550, respectively	45,966	49,891
Fees receivable, net of allowance of $1,916 and $1,736, respectively	136,541	111,784
Due from related parties	30,400	34,814
Fixed assets, net of accumulated depreciation and amortization of $29,982 and $28,355, respectively	39,827	40,496
Goodwill	60,678	60,678
Intangible assets, net of accumulated amortization of $34,487 and $33,081, respectively	28,550	29,955
Deferred tax asset, net	109,208	116,323
Other assets	81,667	88,268
Consolidated Funds
Cash and cash equivalents	3,666	21,988
Securities owned, at fair value	107,482	165,916
Receivable on derivative contracts, at fair value, Consolidated Funds	1,866	2,520
Other investments	376,886	374,111
Receivable from brokers, Consolidated Funds	3,913	5,644
Other assets	260	388
Total Assets	3,288,596	3,296,252
Liabilities
Securities sold, not yet purchased, at fair value	261,586	342,527
Payable for derivative contracts, at fair value	48,875	42,750
Securities loaned	462,854	456,831
Payable to brokers, dealers and clearing organizations	247,621	252,153
Payables to customers	412,646	352,467
Commission management payable	79,805	70,451
Compensation payable	85,675	150,206
Notes payable and other debt	260,244	173,458
Convertible debt	142,962	141,502
Fees payable	19,230	8,047
Due to related parties	544	570
Accounts payable, accrued expenses and other liabilities	110,536	96,533
Consolidated Funds
Payable for derivative contracts, at fair value, Consolidated Funds	1,980	7,130
Payable to brokers, Consolidated Funds	1,616	751
Contributions received in advance	670	0
Capital withdrawals payable	511	11,931
Accounts payable, accrued expenses and other liabilities	128	322
Total Liabilities	2,137,483	2,107,629
Commitments and Contingencies
Redeemable non-controlling interests	392,326	440,604
Stockholders' equity
Additional paid-in capital	1,014,904	1,004,664
(Accumulated deficit) retained earnings	(55,520)	(70,116)
Accumulated other comprehensive income (loss)	(7)	(8)
Less: Class A common stock held in treasury, at cost, 13,129,110 and 12,133,276 shares as of March 31, 2018 and December 31, 2017, respectively.	(200,915)	(186,846)
Total Stockholders' Equity	758,787	748,019
Total Liabilities and Stockholders' Equity	3,288,596	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, 13,129,110 and 12,133,276 shares as of March 31, 2018 and December 31, 2017, respectively.	(200,915)	(186,846)
Common Stock Class B
Stockholders' equity
Common stock	$ 0	$ 0