Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Derivative Instruments and Hedging Transactions (Outstanding Commitments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Derivative [Line Items]    
Purchase commitments $ 261,829 $ 342,287
Sales commitments (180,204) (138,022)
Margin sales commitments (6,932) (5,988)
Open derivative contracts 265,760 347,415
Forward contracts    
Derivative [Line Items]    
Open derivative contracts 201,252 274,994
Future contracts    
Derivative [Line Items]    
Open derivative contracts $ 64,508 $ 72,421