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FAIR VALUE MEASUREMENT - Interest rate swap (Details) - Not designated as hedging instruments - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | $ 23,351 | $ 5,547
Total derivatives liability | 10,755 | 12,322
Derivative assets - current | Foreign exchange forward contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 22,178 | 5,097
Derivative assets - current | Foreign exchange option contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 1,173 | 450
Derivative liabilities - current | Foreign exchange forward contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability | 10,753 | 10,127
Derivative liabilities - current | Foreign exchange option contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability | $ 2 | 25
Derivative liabilities - current | Interest rate swap |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability |  | 329
Derivative liabilities - non-current | Interest rate swap |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability |  | $ 1,841

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