Goodwill and Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Goodwill and identifiable intangible assets
Goodwill	$ 106,970	$ 106,970	$ 106,970
Mutual fund management advisory contracts	42,748	42,748	42,748
Mutual fund management subadvisory contracts	2,700	2,700	8,400
Other	200	200
Total identifiable intangible assets	45,648	45,648	51,148
Total goodwill and identifiable intangible assets	152,618	152,618	$ 158,118
Write down of impaired assets	5,700	$ 5,700
MFC
Goodwill and identifiable intangible assets
Write down of impaired assets	5,700
Reduction of deferred tax liability	$ (2,100)