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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair value information related to assets |  |
Assets | $ 11,416 | $ 22,235
Other mutual funds [Member] |  |
Fair value information related to assets |  |
Assets | 1,239 | 1,373
Money market funds [Member] |  |
Fair value information related to assets |  |
Assets | 10,177 | 20,862
Quoted Prices in Active Markets (Level 1) [Member] |  |
Fair value information related to assets |  |
Assets | 11,416 | 22,235
Quoted Prices in Active Markets (Level 1) [Member] | Other mutual funds [Member] |  |
Fair value information related to assets |  |
Assets | 1,239 | 1,373
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member] |  |
Fair value information related to assets |  |
Assets | 10,177 | 20,862
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value information related to assets |  |
Assets |  |
Significant Other Observable Inputs (Level 2) [Member] | Other mutual funds [Member] |  |
Fair value information related to assets |  |
Assets |  |
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member] |  |
Fair value information related to assets |  |
Assets |  |
Significant Unobserved Inputs (Level 3) [Member] |  |
Fair value information related to assets |  |
Assets |  |
Significant Unobserved Inputs (Level 3) [Member] | Other mutual funds [Member] |  |
Fair value information related to assets |  |
Assets |  |
Significant Unobserved Inputs (Level 3) [Member] | Money market funds [Member] |  |
Fair value information related to assets |  |
Assets |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration