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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