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Investments Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | $ 129,397 | $ 147,753 |
Gross unrealized gains | 2,204 | 451 |
Gross unrealized losses | (816) | (6,456) |
Available-for-sale securities | 130,785 | 141,748 | [1]
Equity Funds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 23,883 | 32,357 |
Gross unrealized gains | 2,112 | 342 |
Gross unrealized losses | (266) | (2,416) |
Available-for-sale securities | 25,729 | 30,283 |
Fixed Income Funds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 105,514 | 115,396 |
Gross unrealized gains | 92 | 109 |
Gross unrealized losses | (550) | (4,040) |
Available-for-sale securities | $ 105,056 | $ 111,465 |
[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 gain 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 (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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