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Recent Accounting Pronouncements Recent Accounting Pronouncements Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jan. 01, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Investments—affiliates $ 134,413   $ 134,413     $ 141,748
Redeemable noncontrolling interest in subsidiaries 29,670   29,670     8,734
Total investments using NAV Practical Expedient 31,002   31,002     31,759 [1]
Income tax provision 31,335 $ 26,437 58,531 $ 48,561    
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 $ 900   $ 900     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).