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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 15, 2009
Lease Commitments          
Reimbursement received   $ 6,997,000      
Total of imputed financing obligation 34,596,000 34,596,000 27,899,000    
MT SPE, LLC
          
Lease Commitments          
Office space under lease (in square feet)         125,000
Lease term (in months)         120
Initial annual base rent amount         3,700,000
Base rent amount for the 10th year         4,800,000
Final year number of the lease for which the annual base rent is disclosed (year number)         10
Number of options         2
Period for extension of lease (in months)         60
Period for termination of lease (in months)         84
Capitalized property plant and equipment       25,100,000  
Capitalization of interest on the building     1,500,000    
Total reimbursement receivable under lease agreement 9,100,000 9,100,000      
Reimbursement to be received under lease agreement in year 2011   1,800,000      
Reimbursement received   7,000,000 300,000    
Additional imputed financial obligation recognized 7,300,000 7,300,000      
Interest expense related to imputed financing obligation 800,000 1,500,000      
Total of imputed financing obligation $ 33,800,000 $ 33,800,000