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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Schedule of marketable securities
Cost	$ 49,580	$ 14,869
Unrealized Loss	(895)	(1,304)
Unrealized Gain	2,960	1,430
Fair Value	51,645	14,995
Sponsored mutual funds and variable insurance funds [Member]
Schedule of marketable securities
Cost	8,421	9,195
Unrealized Loss	(718)	(1,263)
Unrealized Gain	1,662	1,048
Fair Value	9,365	8,980
Investments of consolidated sponsored investment products [Member]
Schedule of marketable securities
Cost	35,068
Unrealized Loss	(165)
Unrealized Gain	657
Fair Value	35,560
Equity securities [Member]
Schedule of marketable securities
Cost	3,619	3,434
Unrealized Loss	0	(3)
Unrealized Gain	489	115
Fair Value	4,108	3,546
Sponsored closed-end funds [Member]
Schedule of marketable securities
Cost	2,472	2,240
Unrealized Loss	(12)	(38)
Unrealized Gain	152	267
Fair Value	$ 2,612	$ 2,469

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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