Annual report pursuant to Section 13 and 15(d)

Hedging Transactions (Outstanding Commitments) (Details)

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Hedging Transactions (Outstanding Commitments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Derivative [Line Items]    
Purchase commitments $ 444,023 $ 489,944
Sale commitments (249,081) (190,108)
Margin sales commitments (12,430) (15,751)
Open derivative contracts 310,316 427,039
Precious metals forward contracts at market values    
Derivative [Line Items]    
Open derivative contracts 202,323 206,055
Future contracts    
Derivative [Line Items]    
Open derivative contracts $ 107,993 $ 220,984