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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