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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Schedule of marketable securities
Cost	$ 14,225	$ 14,869
Unrealized Loss	(924)	(1,304)
Unrealized Gain	2,088	1,430
Fair Value	15,389	14,995
Sponsored mutual funds and variable insurance funds [Member]
Schedule of marketable securities
Cost	8,230	9,195
Unrealized Loss	(894)	(1,263)
Unrealized Gain	1,441	1,048
Fair Value	8,777	8,980
Equity securities [Member]
Schedule of marketable securities
Cost	3,568	3,434
Unrealized Loss		(3)
Unrealized Gain	329	115
Fair Value	3,897	3,546
Sponsored closed-end funds [Member]
Schedule of marketable securities
Cost	2,427	2,240
Unrealized Loss	(30)	(38)
Unrealized Gain	318	267
Fair Value	$ 2,715	$ 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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