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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments—affiliates |  | $ 130,785 |  |  |  |  | $ 130,785 | $ 141,748 | [1] |  |
Redeemable noncontrolling interest in subsidiaries |  | 31,362 |  |  |  |  | 31,362 | 8,734 |  |  |
Total investments using NAV practical expedient | [1] | 83,096 |  |  |  |  | 83,096 | 31,759 |  |  |
Income tax provision |  |  |  |  |  |  | 119,420 | 102,920 |  | $ 89,530 |
Accounting Standards Update 2015-07 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total investments using NAV practical expedient |  |  |  |  |  |  |  | 31,800 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax provision |  | (2,100) | $ (300) | $ (200) | $ (200) | $ (400) |  |  |  |  |
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities |  | $ 700 |  |  |  |  | $ 700 | 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] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, consolidated, carrying amount, assets |  |  |  |  |  |  |  |  |  |  | $ 29,400
Investments—affiliates |  |  |  |  |  |  |  | $ 11,500 |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, 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] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, consolidated, carrying amount, assets |  |  |  |  |  |  |  |  |  |  | 5,500
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities |  |  |  |  |  |  |  |  |  |  | 2,700
Redeemable noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  |  |  | 2,800
Common Stock [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting pronouncements |  |  |  |  |  |  |  |  |  |  | 100
Retained Earnings [Member] | Accounting Standards Update 2015-02 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting pronouncements |  |  |  |  |  |  |  |  |  |  | (100)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2015-02 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting pronouncements |  |  |  |  |  |  |  |  |  |  | $ 831
[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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