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Investments Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Available-for-sale equity securities | $ 131,980 | $ 141,748
Gross unrealized losses | 4,499 | 6,456
Available-for-sale securities, continuous unrealized losses, fair value | 113,800 | 124,000
Available-for-sale securities, continuous unrealized losses, 12 months or longer, fair value | 107,400 | 92,600
Available-for-sale securities, continuous unrealized accumulated losses, 12 months or longer | 4,100 | 5,500
Available-for-sale securities, continuous unrealized losses, 12 months or less, fair value | 6,400 | 31,400
Available-for-sale securities, continuous unrealized accumulated losses, 12 months or less | 400 | 1,000
Trading Securities | 62,300 | 32,400
Domestic Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 43,800 | 9,000
Investments in Federated Funds and other mutual funds [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 8,500 | 11,000
Stocks of large U.S. and international companies [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | $ 6,800 | $ 10,500

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