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Recent Accounting Pronouncements Recent Accounting Pronouncements Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Jan. 01, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Investments—affiliates $ 131,980   $ 141,748
Redeemable noncontrolling interest in subsidiaries 25,905   8,734
Total financial assets 343,103   347,746
Accounting Standards Update 2015-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Investments—affiliates     11,500
Investments Measured Using NAV Practical Expedient [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Investments—affiliates 24,789   24,326 [1]
Total financial assets $ 30,198   31,759
Investments Measured Using NAV Practical Expedient [Member] | Accounting Standards Update 2015-07 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total financial assets     $ 31,759
Retained Earnings [Member] | Accounting Standards Update 2015-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reclassification adjustment from accumulated other comprehensive loss, net of tax to retained earnings   $ 831  
Consolidated Entities [Member] | Accounting Standards Update 2015-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Consolidated assets, investment companies   29,400  
Consolidated liabilities   200  
Redeemable noncontrolling interest in subsidiaries   17,700  
Deconsolidation [Member] | Accounting Standards Update 2015-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Consolidated assets, investment companies   5,500  
Consolidated liabilities   2,700  
Redeemable noncontrolling interest in subsidiaries   $ 2,800  
[1] Investments that calculate NAV as a practical expedient were recategorized and are no longer included in Level 2 as of December 31, 2015 (see Note (2) for additional information).