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Consolidation Consolidated Federated Fund VIEs (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]    
Investments—consolidated investment companies $ 58,072 $ 25,368
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net 14,900 17,000
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]    
Variable Interest Entity [Line Items]    
Investments—consolidated investment companies 43,200 25,400
Less: Liabilities 700 3,000
Less: Redeemable noncontrolling interest in subsidiaries 28,300 8,700
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Cash and Cash Equivalents [Member]    
Variable Interest Entity [Line Items]    
Consolidated assets 0 3,100
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Trade Accounts Receivable [Member]    
Variable Interest Entity [Line Items]    
Consolidated assets $ 700 $ 200