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Investments Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |
Available-for-sale securities | $ 130,785 | $ 141,748 | [1]
Other-than-temporary impairment on available-for-sale security | 1,600 | 1,300 |
Gross unrealized losses | 816 | 6,456 |
Available-for-sale securities, continuous unrealized losses, fair value |  | 124,000 |
Available-for-sale securities, continuous unrealized losses, 12 months or longer, fair value |  | 92,600 |
Available-for-sale securities, continuous unrealized accumulated losses, 12 months or longer |  | 5,500 |
Available-for-sale securities, continuous unrealized losses, 12 months or less, fair value |  | 31,400 |
Available-for-sale securities, continuous unrealized accumulated losses, 12 months or less |  | 1,000 |
Trading securities | 65,500 | 32,400 |
Corporate Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Trading securities | 45,500 | 9,000 |
Mutual Fund [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Trading securities | 8,900 | 11,000 |
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Trading securities | $ 7,200 | $ 10,500 |
[1] | Investments that calculate NAV as a practical expedient were recategorized and are no longer included within Level 2 of the valuation hierarchy as of December 31, 2015 (see Note (2) for additional information).

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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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