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Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair value information related to assets |  |  |
Assets |  | $ 2,756 | $ 2,180
Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets |  | 2,756 | 2,180
Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | [1] | 119 | 118
Money market funds | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | [1] | 119 | 118
Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | [2] | 2,637 | 2,062
Other mutual funds | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | [2] | $ 2,637 | $ 2,062
[1] | Money market funds are included in “Cash and cash equivalents” in the 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.
[2] | Other mutual funds are included in “Other investments and assets” in the Consolidated Balance Sheets. These investments are classified as available-for-sale and are recorded at fair value. Unrealized gains of $1.0 million ($0.6 million after-tax) as of December 31, 2017 and $0.7 million ($0.4 million after tax) as of December 31, 2016 are included in “Accumulated other comprehensive income (loss)” (“AOCI”) in the 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://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=66048111&loc=d3e19207-110258 + Details
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