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Stockholders' Equity (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 item | Nov. 11, 2012 | Oct. 31, 2012 | Dec. 31, 2011
Number of votes | 100 |  |  |
Percentage of one preferred share in one Right | 1.00% |  |  |
Threshold of days following requirements for exercise Rights | 10 days |  |  |
Redemption price per right |  | 0.01 |  |
Purchase price of preferred stock per Unit |  |  | $ 220 |
Preferred stock, shares authorized | 1,000,000 |  |  | 1,000,000
Plan Amendment [Member] |  |  |  |
Purchase price of preferred stock per Unit |  |  | $ 80 |
Class A Junior Participating Preferred Stock [Member] |  |  |  |
Preferred stock, shares authorized | 200,000 |  | 200,000 | 100,000
Class A Junior Participating Preferred Stock [Member] | Plan Amendment [Member] |  |  |  |
Preferred stock, shares authorized |  |  | 100,000 |
Minimum [Member] |  |  |  |
Threshold of common stock percentage for common stock diluted | 15.00% |  |  |
Ownership percentage of common stock | 15.00% |  |  |
Threshold of percentage of assets or earning power sold or transferred for merger | 50.00% |  |  |
Threshold of beneficial ownership of outstanding common stock for the Rights exchanging | 15.00% |  |  |
Threshold of prior acquisition common stock percentage for the Right exchanging | 50.00% |  |  |

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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 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 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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