Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Derivative Instruments and Hedging Transactions (Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Derivative [Line Items]    
Gains (losses) on derivative instruments: $ 8,666 $ (15,133)
Future commodity and forward contracts    
Derivative [Line Items]    
Unrealized gains (losses) on open future commodity and forward contracts and open sale and purchase commitments, net 25,111 (19,898)
Commodity Contract    
Derivative [Line Items]    
Realized (losses) gains on future commodity contracts, net $ (16,445) $ 4,765