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Variable Interest Entity (Details Textuals) (Variable Interest Entity, Primary Beneficiary, USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Variable Interest Entity, Primary Beneficiary
   
Variable Interest Entity [Line Items]    
Variable Interest Entity, Nonexistence Flag No  
The carrying amount of the assets and liabilities of this entity in balance sheet $ 0 $ 0
Involvement with entity $ 0 $ 0
Variable Interest Entity, Similar Entity Aggregation, Description We are not the primary beneficiary of this entity because of shared power. Therefore, we do not consolidate this entity's financial results into our financial statements.