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Related-party arrangements (Details Textual) (USD $)
 1 Months Ended 6 Months Ended 6 Months Ended
May 31, 2012
Aug. 31, 2010
Oct. 31, 2007
Jun. 30, 2012
Jun. 27, 2012
Feb. 08, 2012
Dec. 31, 2011
Dec. 31, 2011
Maximum [Member]
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Related Party Debt [Member]
Related Party Transaction [Line Items]                    
Related party debt description of variable rate                   one-year LIBOR
Interest rate variable rate on borrowings                   3.00%
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              
Amount prepaid for cancellation of indebtedness 200,000,000     (77,200,000)            
Related party transaction prepayment period       90 days            
Limit of borrowings       350,000,000            
Accrued interest of related party debt       11,876,000            
Available borrowings under loan agreement       6,250,000            
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