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Consolidation Consolidated Federated Fund VIEs (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Investments—consolidated investment companies | $ 45,411 | $ 58,072
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net | 12,700 | 14,900
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets | 900 | 2,300
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments—consolidated investment companies | 39,700 | 43,200
Less: Liabilities | 400 | 700
Less: Redeemable noncontrolling interest in subsidiaries | 27,700 | 28,300
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Cash and Cash Equivalents [Member] |  |
Variable Interest Entity [Line Items] |  |
Consolidated VIE assets | 100 | 0
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Trade Accounts Receivable [Member] |  |
Variable Interest Entity [Line Items] |  |
Consolidated VIE assets | $ 1,000 | $ 700

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