Consolidated Statements of Financial Condition (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Assets
Cash and cash equivalents	$ 129,509		$ 54,720
Cash collateral pledged	8,306		10,907
Securities owned, at fair value	792,206		311,039
Receivable on derivative contracts, at fair value	49,877		10,075
Securities borrowed	676,100		927,773
Other investments	167,464		99,483
Receivable from brokers	84,679		69,146
Fees receivable, net of allowance	46,498		45,067
Due from related parties	26,315		26,910
Fixed assets, net of accumulated depreciation and amortization of $25,968 and $21,853, respectively	26,388		26,999
Goodwill	34,906		37,240
Intangible assets, net of accumulated amortization of $25,581 and $26,610, respectively	8,483		12,094
Deferred tax assets, net	129,400		0
Other assets	34,230		15,395
Consolidated Funds
Cash and cash equivalents	501		2,048
Other investments	189,377		187,480
Other assets	1,437		5,624
Total Assets	2,405,676		1,842,000
Liabilities
Securities sold, not yet purchased, at fair value	207,875		130,954
Securities sold under agreement to repurchase	0		3,657
Payable for derivative contracts, at fair value	41,330		7,674
Securities loaned	682,493		918,577
Payable to brokers	335,822		77,235
Compensation payable	134,289		51,807
Convertible debt	118,475	[1]	0
Note Payable	67,144		2,564
Fees payable	6,331		6,324
Due to related parties	474		382
Accounts payable, accrued expenses and other liabilities	46,606		43,475
Consolidated Funds
Capital withdrawals payable	864		5,222
Accounts payable, accrued expenses and other liabilities	222		549
Total Liabilities	1,641,925		1,248,420
Commitments and Contingencies (Note 18)
Redeemable non-controlling interests	86,076		85,814
Stockholders' equity
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized, no shares issued and outstanding	0		0
Additional paid-in capital	772,296		737,341
(Accumulated deficit) retained earnings	(16,027)		(183,243)
Accumulated other comprehensive income (loss)	17		592
Less: Class A common stock held in treasury, at cost, 23,507,656 and 15,873,549 shares as of December 31, 2014 and December 31, 2013, respectively.	(79,771)		(48,084)
Total Stockholders' Equity	677,675		507,766
Total Liabilities and Stockholders' Equity	2,405,676		1,842,000
Common Stock Class A
Stockholders' equity
Common stock	1,160		1,160
Less: Class A common stock held in treasury, at cost, 23,507,656 and 15,873,549 shares as of December 31, 2014 and December 31, 2013, respectively.	(79,771)		(48,084)
Common Stock Class B
Stockholders' equity
Common stock	$ 0		$ 0

[1] The carrying amount of the convertible debt includes unamortized discount of $31.0 million.