CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 505,462	$ 581,313
Cash and cash equivalents segregated under federal and other regulations	3,000	3,000
Financial instruments owned, at fair value, including securities pledged to counterparties that had the right to deliver or repledge of $470,568 at September 30, 2016 and $324,146 at December 31, 2015:
Equities	2,641,499	2,129,208
Debt securities	251,264	136,387
Listed options	12,190	178,360
Other financial instruments	0	445
Total financial instruments owned, at fair value	2,904,953	2,444,400
Collateralized agreements:
Securities borrowed	1,958,095	1,636,284
Receivable from brokers, dealers and clearing organizations	696,495	681,211
Fixed assets and leasehold improvements, less accumulated depreciation and amortization	135,296	94,858
Investments	93,775	98,943
Goodwill and Intangible assets, less accumulated amortization	100,235	100,471
Deferred tax asset, net	151,024	151,225
Assets of businesses held for sale	8,194	25,999
Other assets	194,072	222,831
Total assets	6,750,601	6,040,535
Financial instruments sold, not yet purchased, at fair value:
Equities	1,927,864	1,856,171
Debt securities	278,303	105,340
Listed options	16,319	151,893
Other financial instruments	302	0
Total financial instruments sold, not yet purchased, at fair value	2,222,788	2,113,404
Collateralized financings:
Securities loaned	647,602	463,377
Financial instruments sold under agreements to repurchase	1,034,700	954,902
Other collateralized financings	50,000	0
Total collateralized financings	1,732,302	1,418,279
Payable to brokers, dealers and clearing organizations	647,089	273,805
Payable to customers	29,615	17,387
Accrued compensation expense	96,087	154,547
Accrued expenses and other liabilities	129,548	134,026
Debt	453,524	484,989
Total liabilities	5,310,953	4,596,437
Class A Common Stock
Shares authorized: 1,000,000 at September 30, 2016 and December 31, 2015; Shares issued: 109,012 at September 30, 2016 and 106,025 at December 31, 2015; Shares outstanding: 86,213 at September 30, 2016 and 90,156 at December 31, 2015	1,090	1,060
Additional paid-in capital	1,460,313	1,436,671
Retained earnings	251,625	192,120
Treasury stock, at cost; 22,799 shares at September 30, 2016 and 15,869 shares at December 31, 2015	(273,270)	(186,103)
Accumulated other comprehensive (loss) income	(110)	350
Total equity	1,439,648	1,444,098
Total liabilities and equity	$ 6,750,601	$ 6,040,535