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FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2017

FAIR VALUE MEASUREMENT

Schedule of financial assets and liabilities measured at fair value on a recurring basis

		Fair Value Measurements Using
At December 31, 2017		Total Fair Value and Carrying Value on the Balance Sheets			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
		$			$			$			$
Assets:
Foreign exchange forward contracts			12,316			—			12,316			—
Commodity hedge			3,416			—			3,416			—
Interest rate swap			11,379			—			11,379			—

Total assets			27,111			—			27,111			—


Liabilities:
Interest rate swap			1,359			—			1,359			—
Foreign exchange forward contracts			5,121			—			5,121			—

Total liabilities			6,480			—			6,480			—

		Fair Value Measurements Using
At December 31, 2016		Total Fair Value and Carrying Value on the Balance Sheets			Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
		$			$			$			$
Assets:
Foreign exchange forward contracts			10,632			—			10,632			—
Commodity hedge			4,230			—			4,230			—
Interest rate swap			12,854			—			12,854			—

Total assets			27,716			—			27,716			—


Liabilities:
Interest rate swap			5,418			—			5,418			—
Warrants			711			—			711			—
Foreign exchange forward contracts			3,496			—			3,496			—

Total liabilities			9,625			—			9,625			—

Schedule of fair value of derivative instruments on the consolidated balance sheets

		Fair Value of Derivative Assets
		At December 31, 2016					At December 31, 2017
		Balance Sheet Location		Fair Value			Balance Sheet Location		Fair Value
				$					$
Foreign exchange forward contracts		Derivative assets—current			10,632		Derivative assets—current			12,316
Commodity hedge		Derivative assets—current			1,638		Derivative assets—current			3,416
Interest rate swap		Derivative assets—current			—		Derivative assets—current			468
Commodity hedge		Derivative assets—non-current			2,592		Derivative assets—non-current			—
Interest rate swap		Derivative assets—non-current			12,854		Derivative assets—non-current			10,911

		Total			27,716		Total			27,111

		Fair Value of Derivative Liabilities
		At December 31, 2016					At December 31, 2017
		Balance Sheet Location		Fair Value			Balance Sheet Location		Fair Value
				$					$
Foreign exchange forward contracts		Derivative liabilities—current			3,496		Derivative liabilities—current			5,120
Warrants		Derivative liabilities—current			711		Derivative liabilities—current			—
Interest rate swap		Derivative liabilities—current			5,418		Derivative liabilities—current			1,001
Interest rate swap		Derivative liabilities—non-current			—		Derivative liabilities—non-current			359

		Total			9,625		Total			6,480

Schedule of effect of derivative instruments on consolidated statements of operations

				Amount of Gain (Loss) Recognized in Statements of Operations
				Years Ended December 31
		Location of Gain (Loss) Recognized in Statements of Operations		Years Ended December 31
				2015			2016			2017
				$			$			$
Foreign exchange forward contracts		Gain (loss) on change in fair value of derivatives			(3,738	)		4,798			(2,638	)
Warrants		Gain (loss) on change in fair value of derivatives			(8,887	)		24,554			711
Commodity hedge		Gain (loss) on change in fair value of derivatives			(7	)		75			—
Interest rate swaption		Gain (loss) on change in fair value of derivatives			(107	)		(4,335	)		—
Interest rate swap		Gain (loss) on change in fair value of derivatives			543			2,230			1,655

		Total			(12,196	)		27,322			(272	)