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Derivatives - Net fair value of the Company’s derivative assets and liabilities (Details) (USD $)
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Derivatives - Net Fair Value Of Companys Derivative Assets And Liabilities Details      
Current assets: Derivative instruments        
Noncurrent assets: Derivative instruments 6,167      
Total assets 6,167     
Current liabilities: Derivative instruments 27,224      
Noncurrent liabilities: Derivative instruments        
Total Liabilities $ 27,224