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Stockholders' Equity Stockholders' Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2009 | Dec. 31, 2011 | Apr. 30, 2007
Stockholders' Equity Note [Abstract] |  |  |
Stock Issued During Period, Shares, New Issues |  | 5,520,000 |
Stock Issued During Period, Value, New Issues |  | $ 87,700,000 |
Underwriting Discounts and Commissions |  | 4,600,000 |
Other Indirect Cost In Connection With Public Offering |  | 127,000 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 1,400,000
Stock Repurchased During Period, Shares | 250,158 |  |
Stock Repurchased During Period, Value | $ 2,500,000 |  |

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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher 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=6959260&loc=d3e187085-122770 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: 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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