Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Derivative Instrument and Hedging Transactions (Outstanding Commitments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Derivative [Line Items]    
Purchase commitments $ 697,837 $ 550,810
Sales commitments (229,931) (237,325)
Margin sales commitments (13,598) (12,439)
Open derivative contracts 627,641 474,979
Forward contracts    
Derivative [Line Items]    
Open derivative contracts 401,792 188,530
Future contracts    
Derivative [Line Items]    
Open derivative contracts $ 225,849 $ 286,449