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DERIVATIVE FINANCIAL INSTRUMENTS - Effects of offsetting (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Gross amounts offset in the consolidated balance sheets |  |
Gross amounts of recognized assets | $ 223 | $ 566
Net amounts of assets presented in the consolidated balance sheets | 223 | 566
Gross amounts not offset in the consolidated balance sheets |  |
Net amount | $ 223 | $ 566

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