Goodwill and Identifiable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Goodwill and Identifiable Intangible Assets
Goodwill	$ 106,970us-gaap_Goodwill	$ 106,970us-gaap_Goodwill
Mutual fund management advisory contracts	42,753	42,753
Mutual fund management subadvisory contracts	8,400	8,400
Total identifiable intangible assets	51,153	51,153
Total goodwill and identifiable intangible assets	$ 158,123	$ 158,123

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

+ References

No definition available.

+ Details

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- Definition

Represents the carrying amount of mutual fund management advisory contracts classified as indefinite lived intangible assets as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Represents the carrying amount of mutual fund management subadvisory contracts classified as indefinite lived intangible assets as of the balance sheet date.

+ References

No definition available.

+ Details

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