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DERIVATIVE FINANCIAL INSTRUMENTS - Currency Risk Management (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Foreign Exchange Zero Cost Collars
Disclosure of detailed information about financial instruments [line items]
Net premium payable	$ 0
U S Dollar Call Options
Disclosure of detailed information about financial instruments [line items]
Notional amount	0	$ 0
2018 | Foreign Exchange Zero Cost Collars
Disclosure of detailed information about financial instruments [line items]
Estimated expenditure that is being hedged	84,000
2018 | Foreign Exchange Zero Cost Collars | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Estimated expenditure that is being hedged	$ 276,000

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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