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Shareholders' Equity (Details) (USD $) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Purchase Rights [Member]
Shareholders' Equity [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 [Line Items] |  |  |  |
Preferred Share Purchase Right dividend declared per common share outstanding (in shares) |  |  |  | 1
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares) |  |  |  | 0.01
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share) |  |  |  | $ 100
Redemption price per right (in dollars per share) |  |  |  | $ 0.001
Maximum threshold of common stock ownership, for the entity to redeem rights at the stated price (in hundredths) |  |  |  | 20.00%
Minimum threshold of common stock ownership, for the entity to redeem rights at the stated price (in hundredths) |  |  |  | 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 2: 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: 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 + Details
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