Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 44,730	$ 56,306
Adjustments to reconcile net income to Net cash provided by (used in) operating activities:
Depreciation and amortization	1,271	1,367
Deferred compensation	3,388	1,685
Share-based compensation	9,406	6,636
Deferred income taxes	2,446	(1,389)
Interest accrued on investments and accretion and amortization of discount and premium	(100)
(Gains) losses on investments and derivatives	(605)	142
Changes in assets and liabilities:
Purchases by the Consolidated Investment Products and of other seed money investments	(77,912)
Proceeds from sales or maturities by the Consolidated Investment Products and from other seed money investments	39,371
Due to prime broker by the Consolidated Investment Products	1,868
Fees receivable and accrued fees, net of allowance for doubtful accounts	5,807	2,682
Income taxes receivable	(3,520)	(1,781)
Other assets	(1,888)	242
Accrued compensation and benefits	(21,333)	(13,050)
Accounts payable and accrued expenses	(517)	720
Accrued income taxes payable	(1,051)	(3,538)
Due under tax receivable agreement	(4,966)	0
Other liabilities	2,009	(770)
Net cash provided by (used in) operating activities	(1,596)	49,252
Cash flows from investing activities:
Purchase of Artio Global funds held for deferred compensation	(7,115)	(3,908)
Proceeds from redemptions of Artio Global funds held for deferred compensation	4,707	3,638
Purchase of fixed assets	(1,109)	(871)
Net cash used in investing activities	(3,517)	(1,141)
Cash flows from financing activities:
Repayments of borrowing under term credit facility	(9,000)
Proceeds from secondary offering		69,290
Repurchase and retirement of Class A common stock		(69,290)
Contributions from non-controlling interests in the Consolidated Investment Products	11,265
Distributions paid to non-controlling interests in Holdings	(1,361)	(11,826)
Cash dividends paid	(7,006)	(5,339)
Net cash used in financing activities	(6,102)	(17,165)
Effect of exchange rates on cash	(20)	(22)
Net increase (decrease) in cash and cash equivalents	(11,235)	30,924
Cash and cash equivalents:
Beginning of period	80,043	60,842
End of period	68,808	91,766
Cash paid during period for:
Income taxes, net of refunds	33,772	37,624
Interest expense	1,243	986
Non-cash transactions:
Deferred taxes from step-up in tax basis		161,173
Due under tax receivable agreement		(136,997)
Net benefit from step-up in tax basis		(24,181)
Exchange of New Class A Units for Shares of Class A common stock		(3,267)
Cancelation of Class B common stock		$ 14