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Related-party arrangements (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 9 Months Ended
May 31, 2012
Sep. 30, 2012
Jun. 27, 2012
Principal amount outstanding under loan arrangement sequent to completion of common stock purchase agreement      
Principal amount outstanding at December 31, 2011   $ 277,203  
Borrowings   11,250 21,900
Capitalization of accrued and unpaid interest due and payable as of June 27, 2012   11,876 11,900
Reduction of principal indebtedness related to the issuance of common stock pursuant to common stock purchase agreement completed on June 27, 2012 200,000 (77,187)  
Principal amount outstanding at Sep 30, 2012   $ 223,142