Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:
Net Income	$ 21,767	$ 14,185
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation expense, intangible asset and other amortization	1,675	1,739
Stock-based compensation	1,629	1,448
Excess tax benefit from stock-based compensation	(263)
Amortization of deferred commissions	4,794	2,877
Payments of deferred commissions	(4,559)	(4,281)
Equity in earnings of equity method investments, net of dividends	(134)
Realized and unrealized gains on trading securities	(1,846)	(825)
Realized and unrealized gains on investments of consolidated sponsored investment products	(36)	(372)
(Purchase) sale of trading securities, net	(18,223)	126
Purchase of investments by consolidated sponsored investment products, net	(12,481)	(4,176)
Deferred income taxes	7,925	7,984
Changes in operating assets and liabilities:
Accounts receivable, net and other assets	(4,833)	(6,431)
Other assets of consolidated sponsored investment products	6,480	(799)
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(31,052)	(17,303)
Other liabilities of consolidated sponsored investment products	(4,074)	466
Net cash used in operating activities	(33,231)	(5,362)
Cash Flows from Investing Activities:
Capital expenditures	(439)	(762)
Change in cash and cash equivalents of consolidated sponsored investment products due to deconsolidation	(366)	(734)
Purchase of available-for-sale securities	(53)	(48)
Net cash used in investing activities	(858)	(1,544)
Cash Flows from Financing Activities:
Contingent consideration paid for acquired investment management contracts	0	(145)
Repurchase of common shares	0	(10,356)
Proceeds from exercise of stock options	105	126
Taxes paid related to net share settlement of restricted stock units	(7,401)	(5,157)
Excess tax benefit from stock-based compensation	263
Contributions of noncontrolling interests, net	6,915	4,923
Net cash used in financing activities	(118)	(10,609)
Net decrease in cash and cash equivalents	(34,207)	(17,515)
Cash and cash equivalents, beginning of period	271,545	63,446
Cash and Cash Equivalents, end of period	237,338	45,931
Non-Cash Financing Activities:
Satisfaction of accrued compensation through the issuance of RSU's	849	420
Decrease to noncontrolling interest due to deconsolidation of sponsored investment products, net	$ (45,075)	$ (6,187)