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Investments Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—affiliates | $ 116,136 | $ 130,785
Trading Securities | 50,700 | 65,500
Domestic Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 46,000 | 45,500
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 3,600 | 7,200
Mutual Fund [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | $ 600 | $ 8,900

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