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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).

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