Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Derivative Instruments) (Details)

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Summary of Significant Accounting Policies (Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Derivative [Line Items]    
Realized loss on future commodity contracts, net $ (6,356) $ (17,589)
Futures Commodity And Forwards Contracts And Open Purchase And Sale Commitments [Member]
   
Derivative [Line Items]    
Unrealized gain (loss) on open future commodity and forward contracts and open sale and purchase commitments, net 1,278 (15,886)
Commodity Contract
   
Derivative [Line Items]    
Realized loss on future commodity contracts, net $ (7,634) $ (1,703)