Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Derivative Instrument and Hedging Transactions (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable $ 35,878 $ 38,763
Amounts netted (7,103) (5,031)
Net derivative receivable 28,775 33,732
Gross derivative payable 19,506 43,870
Amounts netted (761) (3,159)
Cash collateral pledge (5,226) (4,257)
Net derivative payables 13,519 36,454
Open sale and purchase commitments    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 28,977 37,378
Amounts netted (7,103) (5,031)
Net derivative receivable 21,874 32,347
Gross derivative payable 755 2,938
Amounts netted (93) (1,019)
Cash collateral pledge 0 0
Net derivative payables 662 1,919
Margin accounts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative payable 13,598 12,439
Amounts netted   0
Cash collateral pledge (5,226) (4,257)
Net derivative payables 8,372 8,182
Future contracts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 6,901 0
Amounts netted 0 0
Net derivative receivable 6,901 0
Gross derivative payable 13,914
Amounts netted 0 0
Net derivative payables 0 13,914
Forward contracts    
Offsetting Assets and Liabilities [Line Items]    
Gross derivative receivable 0 1,385
Amounts netted 0 0
Net derivative receivable 0 1,385
Gross derivative payable 5,153 14,579
Amounts netted (668) (2,140)
Cash collateral pledge 0 0
Net derivative payables $ 4,485 $ 12,439