Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 837,591	$ 261,258
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property	24,251	26,332
Amortization of deferred expenses and share-based incentive compensation	246,129	227,896
Amortization of intangible assets related to acquisitions	3,401	5,946
Deferred tax provision (benefit)	(1,056,659)	9,843
Provision pursuant to tax receivable agreement	547,691	9,064
Loss on extinguishment of debt	60,219
Gain on disposal of subsidiaries	(24,388)
(Increase) decrease in operating assets:
Deposits with banks and short-term investments	(84,386)	(18,626)
Cash deposited with clearing organizations and other segregated cash	7,413	15,630
Receivables-net	34,391	(12,982)
Investments	34,198	(78,820)
Other assets	(105,902)	(114,012)
Increase (decrease) in operating liabilities:
Deposits and other payables	105,215	25,666
Accrued compensation and benefits and other liabilities	(109,770)	58,227
Net cash provided by operating activities	519,394	415,422
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property	(18,479)	(14,161)
Disposals of property	471	1,023
Net cash used in investing activities	(18,008)	(13,138)
Proceeds from:
Contributions from noncontrolling interests	268	1,102
Issuance of senior debt, net of expenses	396,272
Excess tax benefits from share-based incentive compensation	9,516	1,508
Payments for:
Senior debt	(509,098)
Capital lease obligations	(1,435)	(1,738)
Distributions to noncontrolling interests	(15,367)	(9,182)
Payments under tax receivable agreement	(1,276)
Partial extinguishment of tax receivable agreement obligation	(42,222)
Purchase of Class A common stock	(159,471)	(192,657)
Class A common stock dividends	(246,759)	(109,592)
Settlement of vested share-based incentive compensation	(105,007)	(83,783)
Other financing activities	(1,998)	(1,754)
Net cash used in financing activities	(676,577)	(396,096)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(31,405)	(27,086)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(206,596)	(20,898)
CASH AND CASH EQUIVALENTS-January 1	1,066,580	841,482
CASH AND CASH EQUIVALENTS-September 30	$ 859,984	$ 820,584