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Related-party arrangements (Details Textual) (USD $) | 1 Months Ended | 9 Months Ended |  |  |  | 12 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2012 | Aug. 31, 2010 | Oct. 31, 2007 | Sep. 30, 2012 Warrents | Jun. 27, 2012 | Feb. 08, 2012 | Dec. 31, 2011 | Dec. 31, 2011 Maximum [Member] | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Related Party Debt [Member] | Sep. 30, 2012 Loan Arrangement [Member] Related Party Debt [Member] | Sep. 30, 2012 Letter Agreement [Member] Related Party Debt [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate interest |  |  |  | annual interest rate on all outstanding principal to the one year London Interbank Offered Rate (LIBOR) on December 31, 2012 plus 5%, effective beginning on January 1, 2013. |  |  |  |  |  | one-year LIBOR | one-year LIBOR |
Interest rate (LIBOR) |  |  |  | 5.00% |  |  |  |  |  | 3.00% |  | 5.00%
Borrowing rate |  |  |  |  |  |  |  | 4.50% | 4.50% |  |  |
Number of months advances outstanding |  |  |  |  |  |  |  |  | 12 months |  |  |
Related-party arrangements (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Loan agreement with related party |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |
Warrants associated with loan arrangement |  |  |  | 0 |  |  |  |  |  |  |  |
Amount prepaid for cancellation of indebtedness | 200,000,000 |  |  | (77,187,000) |  |  |  |  |  |  |  |
Related party transaction prepayment period |  |  |  | 90 days |  |  |  |  |  |  |  |
Limit of borrowings |  |  |  | 350,000,000 |  |  |  |  |  |  |  |
Accrued interest of related party debt |  |  |  | 11,876,000 | 11,900,000 |  |  |  |  |  |  |
Available borrowings under loan agreement |  |  |  | 11,250,000 | 21,900,000 |  |  |  |  |  |  |
Increased interest rate |  | 5.00% |  |  |  |  |  |  |  |  |  |
Underwritten public offering |  |  |  |  |  | 86,300,000 |  |  |  |  |  |
Units sold composition description |  |  |  |  |  | each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock |  |  |  |  |  |
Common stock warrant to purchase of Share |  |  |  |  |  | 0.6 |  |  |  |  |  |
Company purchased restricted shares of common stock |  |  |  |  |  | 77,200,000 |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 131,522,945 | 31,250,000 |  | 131,522,945 |  |  |  |  |
Restricted shares of common stock and restricted warrants |  |  |  | 107,400,000 |  |  |  |  |  |  |  |
Amended And Restated Promissory Note |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |
Promissory note maturity date |  |  |  | Jan. 01, 2014 |  |  |  |  |  |  |  |

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