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DERIVATIVE FINANCIAL INSTRUMENTS - Effects of offsetting (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross amounts offset in the consolidated balance sheets |  |
Gross amounts of recognized assets | $ 566 | $ 196
Net amounts of assets presented in the consolidated balance sheets | 566 | 196
Gross amounts not offset in the consolidated balance sheets |  |
Net amount | $ 566 | $ 196

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