Quarterly report pursuant to Section 13 or 15(d)

Derivative Instrument and Hedging Transactions (Realized Gain (Loss)) (Details)

v3.6.0.2
Derivative Instrument and Hedging Transactions (Realized Gain (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]        
Gains (losses) on derivative instruments: $ (22,900) $ 2,601 $ (19,009) $ 17,008
Futures Commodity And Forwards Contracts And Open Purchase And Sale Commitments        
Derivative [Line Items]        
Unrealized (losses) gains on open future commodity and forward contracts and open sale and purchase commitments, net (52,983) (596) (34,833) 3,220
Commodity Contract        
Derivative [Line Items]        
Realized gains (losses) on future commodity contracts, net $ 30,083 $ 3,197 $ 15,824 $ 13,788