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Subsequent Events (Details) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Jul. 15, 2011
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May 25, 2011
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Mar. 16, 2011
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Feb. 24, 2012
Issuance of Equity [Member]
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Jan. 17, 2012
Issuance of Equity [Member]
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| Subsequent Event [Line Items] | |||||||||||
| Common Stock, Shares, Issued | 140,596,708 | 40,501,212 | 42,000,000 | 20,000,000 | 25,000,000 | 30,000,000 | 34,000,000 | ||||
| Common Stock, Shares, Issued Pursuant to the Underwriters' Over-allotments | 6,300,000 | 3,000,000 | 3,750,000 | 4,500,000 | 5,100,000 | ||||||
| Equity Issuance, Amount Per Share | $ 9.90 | $ 9.17 | |||||||||
| Proceeds from Issuance of Common Stock | $ 490,200,000 | $ 239,200,000 | $ 294,700,000 | $ 1,006,847,000 | $ 235,275,000 | $ 1,000 | $ 341,600,000 | $ 358,500,000 | |||
| Proceeds from Issuance of Common Stock, Net | 1,000,000,000 | 337,400,000 | 354,500,000 | ||||||||
| Payments of Stock Issuance Costs | $ 17,600,000 | $ 4,200,000 | $ 4,000,000 | ||||||||
| X | ||||||||||
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- Definition
The number of common shares of an entity that have been sold or granted to underwriters of a public offering over and above the original offering The underwrtiers then retain the right sell these additional shares at the offering price. These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. No definition available.
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| X | ||||||||||
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- Definition
The cash inflow from the additional capital contribution to the entity, net of issuance costs. No definition available.
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| X | ||||||||||
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount per share assigned to the consideration received for equity securities issued by a development stage enterprise during a specific stock issuance since its inception. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash outflow for cost incurred directly with the issuance of an equity security. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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