Consolidated Statements of Financial Condition - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents		$ 182,400	$ 259,148
Cash collateral pledged		7,097	6,318
Segregated cash		139,070	176,647
Securities owned, at fair value		900,346	520,888
Receivable on derivative contracts, at fair value		32,220	25,125
Securities Borrowed, Gross		1,390,366	407,795
Other investments ($146,133 and $141,236 at fair value, respectively)		200,297	181,407
Deposits with clearing organizations, brokers and banks		97,723	89,423
Receivable from brokers, dealers and clearing organizations, net of allowance of $780 and $472, respectively		617,368	786,113
Receivable from customers, net of allowance of $563 and $516, respectively		87,480	37,858
Fees receivable, net of allowance of $915 and $1,569, respectively		126,500	111,946
Due from related parties		29,007	33,870
Fixed assets, net of accumulated depreciation and amortization of $29,684 and $31,630, respectively		27,728	26,443
Operating right of use assets		101,628	0
Goodwill		137,728	60,678
Intangible assets, net of accumulated amortization of $44,633 and $38,093, respectively		40,604	24,943
Deferred tax asset, net		86,464	93,057
Other assets		105,265	79,014
Consolidated Funds
Cash and cash equivalents, Consolidated Funds		3,357	38,118
Securities owned, at fair value		345,292	187,633
Receivable on derivative contracts, at fair value		4,454	4,416
Other Investments, Consolidated Funds		177,828	186,395
Receivable from brokers, Consolidated Funds		19,524	8,328
Other assets, Consolidated Funds		2,436	740
Total Assets		4,862,182	3,346,303
Liabilities
Securities sold, not yet purchased, at fair value		438,584	195,307
Payable for derivative contracts, at fair value		22,445	16,082
Securities Loaned, Gross		1,492,986	414,852
Payables to brokers, dealers and clearing organizations		241,012	228,731
Payable to customers		428,146	525,153
Commission management payable		96,731	95,270
Compensation payable		117,634	223,994
Operating Lease, Liability		106,873	0
Notes payable and other debt		315,290	262,965
Convertible debt	[1]	116,273	134,489
Fees payable		45,881	22,565
Due to related parties		675	571
Accounts payable, accrued expenses and other liabilities		162,921	110,423
Consolidated Funds
Payable for derivative contracts, at fair value		2,616	1,663
Payable to brokers		11,126	23,521
Capital withdrawals payable		4,759	11,106
Accounts payable, accrued expenses and other liabilities		494	424
Total Liabilities		3,604,446	2,267,116
Commitments and Contingencies
Redeemable non-controlling interests		440,312	284,780
Stockholders' equity
Additional paid-in capital		1,093,898	1,062,877
(Accumulated deficit) retained earnings		(22,449)	(34,648)
Accumulated other comprehensive income (loss)		(3)	(5)
Less: Class A common stock held in treasury, at cost, 16,664,613 and 15,336,871 shares as of June 30, 2019 and December 31, 2018, respectively.		(254,357)	(234,142)
Total Stockholders' Equity		817,424	794,407
Total Liabilities and Stockholders' Equity		4,862,182	3,346,303
Convertible Preferred Stock
Stockholders' equity
Preferred stock		1	1
Common Stock Class A
Stockholders' equity
Common stock		334	324
Less: Class A common stock held in treasury, at cost, 16,664,613 and 15,336,871 shares as of June 30, 2019 and December 31, 2018, respectively.		(254,357)	(234,142)
Common Stock Class B
Stockholders' equity
Common stock		$ 0	$ 0

[1] The carrying amount of the convertible debt includes an unamortized discount of $17.1 million and $19.5 million as of June 30, 2019 and December 31, 2018, respectively.