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Related Party Transactions (Details) (USD $)	12 Months Ended
Related Party Transactions (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions
Total revenues	$ 1,038,655,000	$ 893,993,000	$ 870,084,000
Receivables due from the Funds	28,300,000	26,400,000
Investment management fees
Related Party Transactions
Total revenues	602,120,000	506,081,000	490,000,000
Rule 12b-1 serve and distribution fees
Related Party Transactions
Total revenues	299,442,000	259,803,000	257,635,000
Shareholder service fees
Related Party Transactions
Total revenues	$ 137,093,000	$ 128,109,000	$ 122,449,000

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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