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Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Total asset derivatives |  |
Gross amounts presented in the consolidated balance sheet | $ 4,503 | $ 5,022
Gross amounts not offset in the consolidated balance sheet subject to netting agreements | (194) | (1,351)
Net amount | 4,309 | 3,671
Total liability derivatives |  |
Gross amounts presented in the consolidated balance sheet | 1,555 | 1,470
Gross amounts not offset in the consolidated balance sheet subject to netting agreements | (194) | (1,351)
Net amount | $ 1,361 | $ 119

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