Goodwill and Identifiable Intangible Assets (Details) (USD $)			0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012 Legend	Dec. 31, 2012 Legend	Sep. 30, 2012 Legend
Goodwill and Identifiable Intangible Assets
Goodwill	$ 106,970,000	$ 106,970,000
Mutual fund management advisory contracts	38,699,000	38,699,000
Mutual fund management subadvisory contracts	16,300,000	16,300,000
Total identifiable intangible assets	54,999,000	54,999,000
Total goodwill and identifiable intangible assets	161,969,000	161,969,000
Goodwill, annual impairment test
Goodwill				16,868,000	59,200,000
Impairment charges			$ 0	$ 42,400,000