Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities:
Net Income	$ 41,559	$ 28,968
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation expense, intangible asset and other amortization	3,340	3,503
Stock-based compensation	4,510	4,044
Excess tax benefits from stock-based compensation	(583)	0
Amortization of deferred commissions	9,578	6,165
Payments of deferred commissions	(8,490)	(9,088)
Equity in (earnings) losses of equity method investments	(61)	18
Realized and unrealized gains on trading securities	(2,751)	(602)
Realized and unrealized (gains) losses on investments of consolidated sponsored investment products	(6,666)	2,784
Sale of trading securities, net	20,576	736
Purchase of investments by consolidated sponsored investment products, net	(150,473)	(13,798)
Sale of securities sold short by consolidated sponsored investment products, net	10,501	0
Deferred income taxes	7,314	16,869
Changes in operating assets and liabilities:
Cash pledged or on deposit of consolidated sponsored investment products	(11,958)	0
Accounts receivable, net and other assets	(5,022)	(8,301)
Other assets of consolidated sponsored investment products	4,455	(1,294)
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(5,306)	(8,547)
Other liabilities of consolidated sponsored investment products	(1,606)	719
Net cash (used in) provided by operating activities	(91,083)	22,176
Cash Flows from Investing Activities:
Capital expenditures	(1,459)	(1,271)
Acquisition of equity method investee	0	(3,364)
Change in cash and cash equivalents of consolidated sponsored investment products due to deconsolidation	(366)	(734)
Purchase of available-for-sale securities	(204)	(96)
Net cash used in investing activities	(2,029)	(5,465)
Cash Flows from Financing Activities:
Contingent consideration paid for acquired investment management contracts	0	(285)
Repurchase of common shares	(12,500)	(14,966)
Proceeds from exercise of stock options	391	361
Taxes paid related to settlement of employee share transactions	(9,271)	(7,172)
Excess tax benefits from stock-based compensation	583	0
Contributions of noncontrolling interests, net	13,092	12,790
Net cash used in financing activities	(7,705)	(9,272)
Net (decrease) increase in cash and cash equivalents	(100,817)	7,439
Cash and cash equivalents, beginning of period	271,545	63,446
Cash and Cash Equivalents, end of period	170,728	70,885
Non-Cash Financing Activities:
Satisfaction of accrued compensation through the issuance of RSU's	849	209
Decrease to noncontrolling interest due to deconsolidation of sponsored investment products, net	(45,003)	(6,187)
Dividend payable	$ 4,179	$ 0