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
Sep. 30, 2015
Jun. 30, 2015
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable $ 21,211 $ 18,253
Amounts netted (10,585) (6,889)
Net derivative receivable 10,626 11,364
Gross derivative payable 19,346 24,153
Amounts netted (1,384) (734)
Cash collateral pledge (5,069) (5,522)
Net derivative payables 12,893 17,897
Open sales and purchase commitments    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 10,624 2,815
Amounts netted (3,116) (1,093)
Net derivative receivable 7,508 1,722
Gross derivative payable 7,562 11,723
Amounts netted (1,379) (734)
Cash collateral pledge 0 0
Net derivative payables 6,183 10,989
Margin accounts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative payable 11,436 12,430
Amounts netted 0 0
Cash collateral pledge (5,069) (5,522)
Net derivative payables 6,367 6,908
Future contracts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 9,917 11,159
Amounts netted (7,075) (5,796)
Net derivative receivable 2,842 5,363
Gross derivative payable 0 0
Amounts netted 0 0
Net derivative payables 0 0
Forward contracts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 670 4,279
Amounts netted (394) 0
Net derivative receivable 276 4,279
Gross derivative payable 348 0
Amounts netted (5) 0
Cash collateral pledge 0 0
Net derivative payables $ 343 $ 0