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Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Sep. 30, 2011 | Jul. 31, 2012 Subsequent Event | Jul. 31, 2012 Subsequent Event Issuance of Equity | Jul. 31, 2012 Subsequent Event Settlement of Debt | Jul. 31, 2012 Tangible Equity Units Subsequent Event Issuance of Equity TEUs | Jul. 31, 2012 6.625% Senior Secured Notes Subsequent Event Issuance of Debt | Jul. 31, 2012 12% Senior Secured Notes Maturing October 2017 Subsequent Event Settlement of Debt | Jul. 31, 2012 Common Stock Subsequent Event Issuance of Equity | Nov. 30, 2010 Cash Secured Loan | Jul. 31, 2012 Cash Secured Loan Subsequent Event Settlement of Debt
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued in public offering |  |  |  |  |  |  |  |  | 22,000,000 |  |
Stock price (US$ per share) |  |  |  |  |  |  |  |  | $ 2.90 |  |
Tangible Equity Units (TEUs) issued during period, (units) |  |  |  |  |  | 4,600,000 |  |  |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  | 7.50% | 6.625% | 12.00% |  |  |
Aggregate principal amount of debt |  |  |  |  |  |  | $ 300.0 |  |  | $ 32.6 |
Net proceeds expected from issuance of common stock, Tangible Equity Units and debt |  |  |  | 466 |  |  |  |  |  |  |
Additional shares that could be purchased to cover over-allotments |  |  |  | 3,300,000 |  |  |  |  |  |  |
Common stock, shares outstanding | 101,116,819 | 75,588,396 | 123,000,000 |  |  |  |  |  |  |  |
Outstanding senior secured debt instrument principal amount redeemed |  |  |  |  |  |  |  | 250 |  |  |
Outstanding cash secured loan repaid in period |  |  |  |  |  |  |  |  |  |  | 20
Net cash used for secured debt redemptions |  |  |  |  | 300 |  |  |  |  |  |
Expected decrease in annualized interest expense |  |  | $ 15 |  |  |  |  |  |  |  |

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