Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 48,763	$ 30,671	$ 96,965
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation expense, intangible asset and other amortization	5,796	6,967	6,759
Stock-based compensation	11,948	11,863	9,778
Excess tax benefit from stock-based compensation	(401)	(1,586)	(24,805)
Amortization of deferred commissions	2,413	7,924	17,907
Payments of deferred commissions	(1,887)	(3,322)	(13,796)
Equity in earnings of equity method investments	(1,075)	(879)	(488)
Realized gain on sale of equity method investment	(2,883)	0	0
Realized and unrealized (gains) losses on trading securities, net	(2,099)	1,158	(914)
Sales (purchases) of trading securities, net	16,828	8,962	26,742
Loss on disposal of fixed assets	185	0	0
Deferred taxes, net	6,399	6,356	4,394
Change in cash pledged or on deposit of consolidated sponsored investment products
Change in operating assets	(1,695)	10,620	(4,157)
Change in operating liabilities	50	(14,795)	17,754
Net cash provided by (used in) operating activities	30,522	(209,430)	(58,871)
Cash Flows from Investing Activities:
Capital expenditures	(2,023)	(4,683)	(2,432)
Proceeds from sale of equity method investment	8,621	0	0
Equity method investment contributions	(2,471)	(1,617)	(5,000)
Cash acquired in business combination	0	89	0
Purchases of available-for-sale securities	(145)	(227)	(313)
Net cash provided by (used) in investing activities	3,079	(6,438)	(8,181)
Cash Flows from Financing Activities:
Borrowings on credit facility	30,000	0	0
Repurchase of common shares	(233,757)	(80,000)	(40,261)
Dividends paid	(13,774)	(16,047)	(8,182)
Proceeds from exercise of stock options	491	116	753
Taxes paid related to net share settlement of restricted stock units	(1,530)	(5,080)	(9,512)
Excess tax benefits from stock-based compensation	401	1,586	24,805
Payment of deferred financing costs	(1,159)	(47)	0
Contributions of noncontrolling interests, net	10,904	55,700	28,653
Net cash (used in) provided by financing activities	(48,298)	109,948	(1,189)
Net decrease in cash and cash equivalents	(14,697)	(105,920)	(68,241)
Cash and cash equivalents, beginning of year	97,384	203,304	271,545
Cash and Cash Equivalents, end of year	82,687	97,384	203,304
Supplemental Disclosure of Cash Flow Information
Interest paid	420	266	266
Income taxes paid, net	16,715	31,850	23,274
Supplemental Disclosure of Non-Cash Activities
Activity related to rabbi trust	(499)	(247)	(843)
Change in accrual for capital expenditures	134	(692)	(311)
Dividends payable	2,650	4,233	4,270
Consolidated Sponsored Investment Products [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Realized and unrealized (gains) losses on trading securities, net	(4,718)	26,532	4,671
Purchases of investments	(187,489)	(453,247)	(382,015)
Sales of investments	274,991	394,552	210,021
Net proceeds (purchases) of short term investments by consolidated sponsored investment products	6,139	(54,495)	(23,856)
(Purchases) sales of securities sold short by consolidated sponsored investment products, net	(4,520)	(1,747)	8,071
Change in cash pledged or on deposit of consolidated sponsored investment products
Change in cash pledged or on deposit of consolidated sponsored investment products	9,604	(2,604)	(10,785)
Change in other assets	(777)	(2,002)	(1,468)
Change in other liabilities	325	2,107	351
Cash Flows from Investing Activities:
Decrease in cash and cash equivalents due to deconsolidation of sponsored investment products, net	(903)	0	(436)
Cash Flows from Financing Activities:
Borrowings of proceeds from short sales by consolidated sponsored investment products	0	1,473	2,555
Payments on borrowings by consolidated sponsored investment products	(3,557)	(350)	0
Supplemental Disclosure of Non-Cash Activities
Decrease to noncontrolling interest due to consolidation and (deconsolidation) of sponsored investment products, net	(47,763)	(648)	(47,165)
Consolidated Investment Product [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Amortization of discount on notes payable of consolidated investment product	3,719	0	0
Realized and unrealized (gains) losses on trading securities, net	1,070	3,505	0
Purchases of investments	(276,727)	(199,892)	0
Sales of investments	125,502	13,864	0
Change in cash pledged or on deposit of consolidated sponsored investment products
Change in other assets	(714)	(426)	0
Change in other liabilities	1,775	484	0
Cash Flows from Financing Activities:
(Repayment) Borrowings of debt of consolidated investment product	(152,597)	152,597	0
Proceeds from issuance of notes payable by consolidated investment product	$ 316,280	$ 0	$ 0

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The cash outflow to reacquire common stock during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Change In Capital Expenditures Incurred, But Not Yet Paid

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Non Cash Financing Activities [Abstract]

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Payments to acquire assets and other investments.

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Proceeds From (Payments For) Other Investments, Operating Activities

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