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Investments Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
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

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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