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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | $ 11,445 | $ 21,322 | $ 31,337
Deferred compensation fund | 22,200 | 17,831 |
Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 18,608 | 13,717 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 3,592 | 4,114 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 22,200 | 17,831 |
Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 22,200 | 17,831 |
Municipal Bonds [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 0 | 0 |
Municipal Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 11,445 | 21,322 |
Municipal Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 0 | 0 |
Municipal Bonds [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 11,445 | 21,322 |
Municipal Bonds [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 11,445 | 21,322 |
Money Market [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Money Market [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 3,592 | 4,114 |
Money Market [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Money Market [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 3,592 | 4,114 |
Money Market [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 3,592 | 4,114 |
Balanced And Lifestyle [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 8,174 | 6,311 |
Balanced And Lifestyle [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Balanced And Lifestyle [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Balanced And Lifestyle [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 8,174 | 6,311 |
Balanced And Lifestyle [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 8,174 | 6,311 |
Large Cap Growth [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,292 | 2,724 |
Large Cap Growth [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Large Cap Growth [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Large Cap Growth [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,292 | 2,724 |
Large Cap Growth [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,292 | 2,724 |
Small Cap Value [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,173 | 1,936 |
Small Cap Value [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Small Cap Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Small Cap Value [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,173 | 1,936 |
Small Cap Value [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,173 | 1,936 |
Fixed Income [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,962 | 1,461 |
Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Fixed Income [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,962 | 1,461 |
Fixed Income [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,962 | 1,461 |
International [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,079 | 785 |
International [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
International [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
International [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,079 | 785 |
International [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,079 | 785 |
Mid Cap Growth [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 928 | 500 |
Mid Cap Growth [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Mid Cap Growth [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 | 0 |
Mid Cap Growth [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 928 | 500 |
Mid Cap Growth [Member] | Total Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | $ 928 | $ 500 |

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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