Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income (loss)	$ 39,379	$ 25,619
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Bad debt expense	379	465
Depreciation and amortization	857	736
(Income) loss from equity method investments	(3,104)	(2,069)
Equity-based compensation	25,903	16,693
Deferred tax provision	(106)	221
Other	1,831	21
Changes in assets and liabilities:
Accounts receivable	(11,707)	6,766
Other receivables	2,212	1,026
Prepaid expenses and other assets	(3,737)	434
Deferred compensation	(1,946)	(4,019)
Compensation payable	(85,706)	(95,298)
Accounts payable and accrued expenses	3,678	(4,448)
Deferred revenue	6,527	2,194
Dividends received		803
Other liabilities	310	228
Net cash provided by (used in) operating activities	(25,230)	(50,628)
Cash flows from investing activities
Purchase of investments	(27,955)	(27,970)
Proceeds from sales of investments	33,000	18,000
Return of capital from equity method investments		9
Note payments received from employees	403
Notes issued to employees		(352)
Purchase of equipment and leasehold improvements	(1,798)	(989)
Change in restricted cash	37	25
Net cash provided by (used in) investing activities	3,687	(11,277)
Cash flows from financing activities
Dividends and distributions	(129,154)	(92,844)
Payments under tax receivable agreement	(5,032)
Payments to settle employee tax obligations on share-based awards	(7,534)	(1,847)
Class A partnership units and other equity purchased	(101)
Net cash provided by (used in) financing activities	(141,821)	(94,691)
Effect of exchange rate fluctuations on cash and cash equivalents	765	(872)
Net increase (decrease) in cash and cash equivalents	(162,599)	(157,468)
Cash and cash equivalents, beginning of period	318,926	248,022
Cash and cash equivalents, end of period	156,327	90,554
Cash paid during the period for:
Income taxes	11,369	9,468
Dividends paid, declared in the prior year	68,066
Other non-cash activity
Dividend equivalents issued	3,706	$ 5,351
Class A Partnership Units or other equity converted into Class A Common Stock	22,181
Forfeiture of fully-vested Group LP units or other equity units	36
ASU 2016-09
Other non-cash activity
Cumulative Effect Adjustment upon Adoption of ASU	$ 658