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Recent Accounting Pronouncements Recent Accounting Pronouncements Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Jan. 01, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Investments—affiliates $ 129,208       $ 129,208     $ 141,748
Redeemable noncontrolling interest in subsidiaries 29,945       29,945     8,734
Total investments using NAV practical expedient 91,898       91,898     31,759 [1]
Income tax provision 32,597   $ 26,072   91,128 $ 74,633    
Accounting Standards Update 2016-09 [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Income tax provision   $ (200)   $ (400)        
Retained Earnings [Member] | Accounting Standards Update 2015-02 [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Reclassification adjustment relating to adoption of new accounting pronouncements             $ (831)  
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Reclassification adjustment relating to adoption of new accounting pronouncements             (100)  
Common Stock [Member] | Accounting Standards Update 2016-09 [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Reclassification adjustment relating to adoption of new accounting pronouncements             100  
Accumulated Other Comprehensive Loss, Net of Tax [Member] | Accounting Standards Update 2015-02 [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Reclassification adjustment relating to adoption of new accounting pronouncements             831  
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Liabilities $ 1,200       $ 1,200     3,000
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Accounting Standards Update 2015-02 [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Consolidated assets, investment companies             29,400  
Investments—affiliates               $ 11,500
Liabilities             200  
Redeemable noncontrolling interest in subsidiaries             17,700  
Variable Interest Entity, Not Primary Beneficiary [Member] | Accounting Standards Update 2015-02 [Member] | Deconsolidation [Member]                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Consolidated assets, investment companies             5,500  
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 within Level 2 of the valuation hierarchy as of December 31, 2015 (see Note (2) for additional information).