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Derivative Instruments and Hedging Activities - Offsetting of Derivative Assets and Liabilities in the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative assets |  |
Gross amounts of recognized assets | $ 6,605 | $ 2,991
Gross amounts offset in the statement of financial position | (306) | 0
Net amounts of assets presented in the statement of financial position | 6,299 | 2,991
Gross amounts of financial instruments not offset in the statement of financial position | 18 | 0
Net amount | 6,317 | 2,991
Derivative liabilities |  |
Gross amounts of recognized liabilities | 1,106 | 40,259
Gross amounts offset in the statement of financial position | (306) | 0
Net amounts of liabilities presented in the statement of financial position | 800 | 40,259
Gross amounts of financial instruments not offset in the statement of financial position | 0 | 757
Net amount | $ 800 | $ 41,016

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