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INCOME TAXES - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation between the provision for income tax computed by applying Canadian federal and provincial statutory tax rates to income before income taxes and the actual provision and benefit for income taxes
Combined federal and provincial income tax rate (as a percent)	27.00%	27.00%	27.00%
Effect of permanent difference (as a percent)	(16.00%)	1.00%
Effect of different tax rate on earnings in other jurisdictions (as a percent)	(18.00%)	(3.00%)	(2.00%)
Effect of tax holiday (as a percent)	(4.00%)
Unrecognized tax provision (as a percent)	4.00%
Change in valuation allowance (as a percent)	32.00%		(1.00%)
Effect of tax credit (as a percent)	(7.00%)
Effect of true-up (as a percent)	4.00%	(1.00%)
Foreign exchange effect (as a percent)		(2.00%)
Actual income tax rate (as a percent)	22.00%	22.00%	24.00%
Additional disclosure
Withholding income tax rate on dividends distributed by foreign invested enterprises (as a percent)	10.00%
Undistributed earnings of subsidiaries and affiliates considered to be permanently reinvested	$ 284,300
Provision for withholding income tax on dividend	$ 0
Preferential withholding tax rate (as a percent)	5.00%
Aggregate amount and per share effect of the tax holiday
The aggregate amount (in dollars)	$ 3,343
Per share effect - basic (in dollars per share)	$ 0.06
Per share effect - diluted (in dollars per share)	$ 0.06
Minimum
Additional disclosure
Unrecognized deferred tax liabilities	$ 14,200
Withholding tax rate (as a percent)	5.00%
Maximum
Additional disclosure
Unrecognized deferred tax liabilities	$ 28,400
Withholding tax rate (as a percent)	10.00%

X

- Definition

The domestic federal statutory tax rate and provincial corporate income tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to foreign exchange gain (loss).

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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