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Fair Value Measurements - Recurring and Nonrecurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Fair value information related to assets |  |
Assets | $ 4,513 | $ 2,310
Quoted Prices in Active Markets (Level 1) |  |
Fair value information related to assets |  |
Assets | 4,513 | 2,310
Money market funds |  |
Fair value information related to assets |  |
Assets | 2,118 | 118
Money market funds | Quoted Prices in Active Markets (Level 1) |  |
Fair value information related to assets |  |
Assets | 2,118 | 118
Other mutual funds |  |
Fair value information related to assets |  |
Assets | 2,395 | 2,192
Other mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Fair value information related to assets |  |
Assets | $ 2,395 | $ 2,192

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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