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Investments Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |
Available-for-sale equity securities | $ 134,413 | $ 141,748
Gross unrealized losses | 2,181 | 6,456
Available-for-sale securities, continuous unrealized losses, fair value | 108,900 | 124,000
Available-for-sale securities, continuous unrealized losses, 12 months or longer, fair value | 107,700 | 92,600
Available-for-sale securities, continuous unrealized accumulated losses, 12 months or longer | 2,100 | 5,500
Other-than-temporary impairment on available-for-sale securities | 1,600 |
Trading Securities | 64,200 | 32,400
Domestic Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 44,600 | 9,000
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | 8,900 | 10,500
Mutual Fund [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities | $ 8,800 | $ 11,000

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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