Quarterly report pursuant to Section 13 or 15(d)

Schedule of Offsetting Derivative Instruments by Type (Details)

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Schedule of Offsetting Derivative Instruments by Type (Details) - Forward Contracts - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Commodity Contracts    
Derivative Asset, Fair Value, Net    
Gross Amounts of Recognized Assets $ 719 $ 980
Gross Amounts offset in the Statement of Financial Position (719) (950)
Net Amounts of Assets Presented in the Statement of Financial Position 0 30
Derivative, Collateral, Obligation to Return Securities 0 (30)
Cash Collateral Received 0 0
Derivative Asset, Net Amount 0 0
Derivative Liability, Fair Value, Net    
Gross Amounts of Recognized Liabilities 1,381 1,669
Gross Amounts offset in the Statement of Financial Position (719) (950)
Net Amounts of Liabilities Presented in the Statement of Financial Position 662 719
Derivative, Collateral, Right to Reclaim Securities 0 (30)
Cash Collateral Pledged 0 0
Derivative Liability, Net Amount 662 689
Fair Value Hedge    
Derivative Asset, Fair Value, Net    
Gross Amounts of Recognized Assets 5,130 4,389
Gross Amounts offset in the Statement of Financial Position 0 0
Net Amounts of Assets Presented in the Statement of Financial Position 5,130 4,389
Derivative, Collateral, Obligation to Return Securities 0 0
Cash Collateral Received 0 0
Derivative Asset, Net Amount $ 5,130 $ 4,389