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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 22, 2011 | Dec. 31, 2011
Stockholders' Equity Note [Abstract] |  |
Issuance of common stock, net of offering costs, shares | 5,520,000 |
Issuance of common stock, net of offering costs | $ 87,700,000 | $ 87,700,000
Underwriting Discounts and Commissions | 4,600,000 |
Other Indirect Cost In Connection With Public Offering | $ 127,000 |

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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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