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Fair Value Measurement (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets and liabilities measured at fair value |  |
Total | $ 0 | $ 16,744
Total investments at fair value | 28,593 | 40,459
Level 1 |  |
Assets and liabilities measured at fair value |  |
Total | 0 | 16,744
Level 2 |  |
Assets and liabilities measured at fair value |  |
Total | 0 | 0
Level 3 |  |
Assets and liabilities measured at fair value |  |
Total | 0 | 0
Interest in registered investment companies |  |
Assets and liabilities measured at fair value |  |
Deferred compensation investments valued using net asset value as a practical expedient: | 14,921 | 10,140
Fixed income fund |  |
Assets and liabilities measured at fair value |  |
Deferred compensation investments valued using net asset value as a practical expedient: | 13,672 | 13,575
Available for sale investment |  |
Assets and liabilities measured at fair value |  |
Total | 0 | 16,744
Available for sale investment | Level 1 |  |
Assets and liabilities measured at fair value |  |
Total | 0 | 16,744
Available for sale investment | Level 2 |  |
Assets and liabilities measured at fair value |  |
Total | 0 | 0
Available for sale investment | Level 3 |  |
Assets and liabilities measured at fair value |  |
Total | $ 0 | $ 0

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- Definition Fair value of investment in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes measurement of net asset value as estimate of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258 + Details
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