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Consolidation Consolidated Federated Fund VIEs (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Variable Interest Entities [Line Items]    
Investments—Consolidated Investment Companies $ 33,603 $ 45,411
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities 11,300 12,700
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]    
Variable Interest Entities [Line Items]    
Investments—Consolidated Investment Companies 31,700 39,700
Less: Liabilities 600 400
Less: Redeemable noncontrolling interest in subsidiaries 20,300 27,700
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Cash and Cash Equivalents [Member]    
Variable Interest Entities [Line Items]    
Consolidated VIE assets 0 100
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Trade Accounts Receivable [Member]    
Variable Interest Entities [Line Items]    
Consolidated VIE assets $ 500 $ 1,000