Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Transactions (Outstanding Commitments) (Details)

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Derivative Instruments and Hedging Transactions (Outstanding Commitments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Derivative [Line Items]    
Purchase commitments $ 264,219 $ 166,600
Sales commitments (169,618) (158,870)
Margin sales commitments (7,873) (11,652)
Open derivative contracts 278,907 205,830
Forward contracts    
Derivative [Line Items]    
Open derivative contracts 99,652 133,612
Future contracts    
Derivative [Line Items]    
Open derivative contracts $ 179,255 $ 72,218