Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:
Net Income	$ 77,130	$ 37,773	$ 145,420
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense, intangible asset and other amortization	7,046	6,198	5,865
Stock-based compensation	7,960	6,927	5,625
Excess tax benefit from stock-based compensation	(478)	(89)
Amortization of deferred commissions	14,453	10,715	8,874
Payments of deferred commissions	(18,912)	(10,868)	(11,392)
Equity in (earnings) losses of equity method investments, net of dividends	(161)		223
Realized and unrealized (gains) losses on trading securities	(2,350)	(1,891)	256
Realized and unrealized gains on investments of consolidated sponsored investment products	(3,515)	(2,072)
(Purchase) sale of trading securities, net	(2,701)	2,025	(4,425)
Purchase of investments by consolidated sponsored investment products, net	(100,499)	(41,155)
Deferred income taxes	32,596	26,689	(132,477)
Changes in operating assets and liabilities:
Accounts receivable, net and other assets	(13,416)	(10,047)	(5,953)
Other assets of consolidated sponsored investment products	(6,043)	(683)	(945)
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	37,575	15,919	13,316
Other liabilities of consolidated sponsored investment products	152	377	(737)
Net cash provided by operating activities	28,837	39,818	23,650
Cash Flows from Investing Activities:
Capital expenditures	(2,009)	(3,782)	(743)
Change in cash and cash equivalents of consolidated sponsored investment products due to deconsolidation	(662)
Other acquisitions	(3,364)	(350)	(3,068)
Purchase of available-for-sale securities	(196)	(379)	(259)
Acquisitions of businesses		(656)
Net cash used in investing activities	(6,231)	(5,167)	(4,070)
Cash Flows from Financing Activities:
Contingent consideration paid for acquired investment management contracts	(630)	(665)	(789)
Preferred stock dividends paid			(10,186)
Repurchase of common shares	(19,704)	(8,940)	(7,870)
Proceeds from exercise of stock options	570	2,636	1,345
Payment of deferred financing costs	(26)	(700)	(41)
Taxes paid related to net share settlement of restricted stock units	(7,513)	(11,951)	(720)
Proceeds from issuance of common stock, net of issuance costs	191,771
Excess tax benefit from stock-based compensation	478	89
Repayment of debt	(15,000)
Contributions of noncontrolling interests, net	35,547	3,059
Net cash provided by (used in) financing activities	185,493	(16,472)	(18,261)
Net increase in cash and cash equivalents	208,099	18,179	1,319
Cash and cash equivalents, beginning of period	63,446	45,267	43,948
Cash and Cash Equivalents, end of period	271,545	63,446	45,267
Supplemental Cash Flow Information:
Interest paid	393	415	362
Income taxes paid, net	1,697	74	427
Non-Cash Investing Activities:
Purchase of investment management contracts		435
Non-cash activity related to rabbi trust	(1,250)	(144)	(486)
Non-Cash Financing Activities:
Satisfaction of accrued compensation through the issuance of RSU's	609	(58)	273
Increase to noncontrolling interest due to consolidation of sponsored investment products, net	1,477
Preferred stock conversion		$ 35,217