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Investments Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available-for-sale equity securities | $ 129,208 | $ 141,748
Trading Securities | 66,200 | 32,400
Domestic Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 47,100 | 9,000
Mutual Fund [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 9,000 | 11,000
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | $ 6,200 | $ 10,500

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