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Fair Value Measurements - Recurring and Nonrecurring Basis (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Fair value information related to assets |  |  |
Assets | $ 3,832 |  | $ 2,141
Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | 1,818 |  | 118
Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | 2,014 | 2,000 | 2,023
Quoted Prices in Active Markets (Level 1) |  |  |
Fair value information related to assets |  |  |
Assets | 3,832 |  | 2,141
Quoted Prices in Active Markets (Level 1) | Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | 1,818 |  | 118
Quoted Prices in Active Markets (Level 1) | Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | 2,014 |  | 2,023
Significant Other Observable Inputs (Level 2) |  |  |
Fair value information related to assets |  |  |
Assets | 0 |  | 0
Significant Other Observable Inputs (Level 2) | Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | 0 |  | 0
Significant Other Observable Inputs (Level 2) | Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | 0 |  | 0
Significant Unobserved Inputs (Level 3) |  |  |
Fair value information related to assets |  |  |
Assets | 0 |  | 0
Significant Unobserved Inputs (Level 3) | Money market funds |  |  |
Fair value information related to assets |  |  |
Assets | 0 |  | 0
Significant Unobserved Inputs (Level 3) | Other mutual funds |  |  |
Fair value information related to assets |  |  |
Assets | $ 0 |  | $ 0

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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=25499696&loc=d3e19207-110258 + Details
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