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Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Fair value information related to assets |  |  |
Assets |  | $ 3,115 | $ 2,638
Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets |  | 3,115 | 2,638
Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | [1] | 122 | 121
Money market funds | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | [1] | 122 | 121
Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | [2] | 2,993 | 2,517
Other mutual funds | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | [2] | $ 2,993 | $ 2,517
[1] | Money market funds are included in “Cash and cash equivalents” in the Condensed Consolidated Balance Sheets. These investments are classified as available-for-sale and are recorded at fair value. There have been no realized gains or losses related to these investments and we have not experienced any redemption restrictions with respect to any of the money market mutual funds. Other mutual funds are included in “Other investments and assets” in the Condensed Consolidated Balance Sheets.
[2] | Other mutual funds are included in “Other investments and assets” in the Condensed Consolidated Balance Sheets.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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