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Shareholders' Equity (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders' Equity Note [Abstract] |  |  |
Number of shares authorized for issue (in shares) | 61,000,000 |  |
Common Stock, authorized (in shares) | 60,000,000 | 60,000,000 | 60,000,000
Common Stock, par value (in dollars per share) | $ 0.375 | $ 0.375 |
Preferred Stock, authorized (in shares) | 1,000,000 | 1,000,000 |
Preferred Stock, par value (in dollars per share) | $ 0.02 | $ 0.02 |
Class of Warrant or Right |  |  |
Preferred Share purchase rights expiration date | Dec. 26, 2016 |  |
Purchase Rights |  |  |
Class of Warrant or Right |  |  |
Preferred Share purchase right dividend declared per common share outstanding (in shares) | 1.00 |  |
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share) | $ 100 |  |
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares) | 0.01 |  |
Maximum threshold of common stock ownership | 20.00% |  |
Redemption price per right | $ 0.001 |  |
Minimum threshold of common stock ownership | 10.00% |  |

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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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