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Consolidation Consolidated Federated Fund VIEs (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Variable Interest Entities [Line Items] |  |
Investments—consolidated investment companies | $ 45,046 | $ 58,072
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities | 15,100 | 14,900
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets | 1,200 | 2,300
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |
Variable Interest Entities [Line Items] |  |
Investments—consolidated investment companies | 43,400 | 43,200
Less: Liabilities | 600 | 700
Less: Redeemable noncontrolling interest in subsidiaries | 28,600 | 28,300
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Cash and Cash Equivalents [Member] |  |
Variable Interest Entities [Line Items] |  |
Consolidated VIE assets | 100 | 0
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Trade Accounts Receivable [Member] |  |
Variable Interest Entities [Line Items] |  |
Consolidated VIE assets | $ 800 | $ 700

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