Quarterly report pursuant to Section 13 or 15(d)

Derivative Instrument and Hedging Transactions (Offsetting Assets and Liabilities) (Details)

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Derivative Instrument and Hedging Transactions (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable $ 18,080 $ 18,253
Amounts netted (957) (6,889)
Net derivative receivable 17,123 11,364
Gross derivative payable 27,971 24,153
Amounts netted (1,914) (734)
Cash collateral pledge (6,127) (5,522)
Net derivative payables 19,930 17,897
Open sales and purchase commitments    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 3,736 2,815
Amounts netted (957) (1,093)
Net derivative receivable 2,779 1,722
Gross derivative payable 15,515 11,723
Amounts netted (1,914) (734)
Cash collateral pledge 0 0
Net derivative payables 13,601 10,989
Margin accounts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative payable 12,456 12,430
Amounts netted 0 0
Cash collateral pledge (6,127) (5,522)
Net derivative payables 6,329 6,908
Future contracts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 11,411 11,159
Amounts netted 0 (5,796)
Net derivative receivable 11,411 5,363
Forward contracts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 2,933 4,279
Amounts netted 0 0
Net derivative receivable $ 2,933 $ 4,279