Annual report pursuant to Section 13 and 15(d)

Schedule of Offsetting Derivative Instruments by Type (Details)

v3.6.0.2
Schedule of Offsetting Derivative Instruments by Type (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Forward Contracts | Commodity Contracts    
Derivative Asset    
Gross Amounts of Recognized Assets $ 5,169 $ 1,112
Gross Amounts Offset in the Statement of Financial Position (1,567) (820)
Net Amounts of Assets Presented in the Statement of Financial Position 3,602 292
Derivative, Collateral, Obligation to Return Securities (3,602) (292)
Cash Collateral Received 0 0
Derivative Asset, Net Amount 0 0
Derivative Liability    
Gross Amounts of Recognized Liabilities 6,730 1,704
Gross Amounts Offset in the Statement of Financial Position (1,567) (820)
Net Amounts of Assets Presented in the Statement of Financial Position 5,163 884
Derivative Liability, Not Subject to Master Netting Arrangement Deduction (3,602) (292)
Cash Collateral Pledged 0 0
Derivative Liability, Net Amount 1,561 592
Forward Contracts | Fair Value Hedges    
Derivative Asset    
Gross Amounts of Recognized Assets 14,777 33,797
Gross Amounts Offset in the Statement of Financial Position 0 0
Net Amounts of Assets Presented in the Statement of Financial Position 14,777 33,797
Derivative, Collateral, Obligation to Return Securities 0 0
Cash Collateral Received 0 0
Derivative Asset, Net Amount 14,777 33,797
Swaps | Commodity Contracts    
Derivative Asset    
Gross Amounts of Recognized Assets   39,739
Gross Amounts Offset in the Statement of Financial Position   (24,940)
Net Amounts of Assets Presented in the Statement of Financial Position   14,799
Derivative, Collateral, Obligation to Return Securities   0
Cash Collateral Received   0
Derivative Asset, Net Amount   14,799
Derivative Liability    
Gross Amounts of Recognized Liabilities   24,940
Gross Amounts Offset in the Statement of Financial Position   (24,940)
Net Amounts of Assets Presented in the Statement of Financial Position   0
Derivative Liability, Not Subject to Master Netting Arrangement Deduction   0
Cash Collateral Pledged   0
Derivative Liability, Net Amount   0
Swaps | Interest Rate Swaps    
Derivative Asset    
Gross Amounts of Recognized Assets 29 30
Gross Amounts Offset in the Statement of Financial Position (29) (30)
Net Amounts of Assets Presented in the Statement of Financial Position 0 0
Derivative, Collateral, Obligation to Return Securities 0 0
Cash Collateral Received 0 0
Derivative Asset, Net Amount 0 0
Derivative Liability    
Gross Amounts of Recognized Liabilities 1,985 2,206
Gross Amounts Offset in the Statement of Financial Position (29) (30)
Net Amounts of Assets Presented in the Statement of Financial Position 1,956 2,176
Derivative Liability, Not Subject to Master Netting Arrangement Deduction 0 0
Cash Collateral Pledged 0 0
Derivative Liability, Net Amount $ 1,956 $ 2,176