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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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- Definition

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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