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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Outstanding and Exercisable Options (Details) - 12 months ended Dec. 31, 2017	USD ($) $ / shares shares	CAD / shares
Canada, Dollars
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	393,100
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	393,100
Exercisable options, intrinsic value | $	$ 0.00
Canada, Dollars | $0.00 to $4.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		CAD 0.00
Options exercisable, weighted average price (per share) | CAD / shares		0.00
Canada, Dollars | $0.00 to $4.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		4.99
Options exercisable, weighted average price (per share) | CAD / shares		4.99
Canada, Dollars | $5.00 to $9.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	393,100
Options outstanding, weighted average price (per share) | CAD / shares		8.26
Options outstanding, weighted average remaining contractual life	1 year 2 months 2 days
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	393,100
Options exercisable, weighted average price (per share) | CAD / shares		8.26
Options exercisable, weighted average remaining contractual life	1 year 2 months 2 days
Exercisable options, intrinsic value | $	$ 0.00
Canada, Dollars | $5.00 to $9.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		5.00
Options exercisable, weighted average price (per share) | CAD / shares		5.00
Canada, Dollars | $5.00 to $9.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		9.99
Options exercisable, weighted average price (per share) | CAD / shares		9.99
Canada, Dollars | $10.00 to $14.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		10.00
Options exercisable, weighted average price (per share) | CAD / shares		10.00
Canada, Dollars | $10.00 to $14.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		14.99
Options exercisable, weighted average price (per share) | CAD / shares		14.99
Canada, Dollars | $15.00 to $19.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		15.00
Options exercisable, weighted average price (per share) | CAD / shares		15.00
Canada, Dollars | $15.00 to $19.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share) | CAD / shares		19.99
Options exercisable, weighted average price (per share) | CAD / shares		CAD 19.99
United States of America, Dollars
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	1,635,747
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	1,270,567
Exercisable options, intrinsic value | $	$ 0.00
United States of America, Dollars | $0.00 to $4.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	1,276,456,000
Options outstanding, weighted average price (per share)	$ 2,970.00
Options outstanding, weighted average remaining contractual life	1639 days
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	911,276,000
Options exercisable, weighted average price (per share)	$ 3,240.00
Options exercisable, weighted average remaining contractual life	1727 days
Exercisable options, intrinsic value | $	$ 0.00
United States of America, Dollars | $0.00 to $4.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	$ 0.00
Options exercisable, weighted average price (per share)	0.00
United States of America, Dollars | $0.00 to $4.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	4.99
Options exercisable, weighted average price (per share)	$ 4.99
United States of America, Dollars | $5.00 to $9.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	255,762,000
Options outstanding, weighted average price (per share)	$ 6,000.00
Options outstanding, weighted average remaining contractual life	1497 days
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	255,762,000
Options exercisable, weighted average price (per share)	$ 6,000.00
Options exercisable, weighted average remaining contractual life	1497 days
Exercisable options, intrinsic value | $	$ 0.00
United States of America, Dollars | $5.00 to $9.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	$ 5.00
Options exercisable, weighted average price (per share)	5.00
United States of America, Dollars | $5.00 to $9.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	9.99
Options exercisable, weighted average price (per share)	$ 9.99
United States of America, Dollars | $10.00 to $14.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	90,779,000
Options outstanding, weighted average price (per share)	$ 10,690.00
Options outstanding, weighted average remaining contractual life	183 days
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	90,779,000
Options exercisable, weighted average price (per share)	$ 10,690.00
Options exercisable, weighted average remaining contractual life	183 days
Exercisable options, intrinsic value | $	$ 0.00
United States of America, Dollars | $10.00 to $14.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	$ 10.00
Options exercisable, weighted average price (per share)	10.00
United States of America, Dollars | $10.00 to $14.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	14.99
Options exercisable, weighted average price (per share)	$ 14.99
United States of America, Dollars | $15.00 to $19.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, quantity (in shares) | shares	12,750,000
Options outstanding, weighted average price (per share)	$ 15,610.00
Options outstanding, weighted average remaining contractual life	1105 days
Options outstanding, intrinsic value | $	$ 0.00
Options exercisable, quantity (in shares) | shares	12,750,000
Options exercisable, weighted average price (per share)	$ 15,610.00
Options exercisable, weighted average remaining contractual life	1105 days
Exercisable options, intrinsic value | $	$ 0.00
United States of America, Dollars | $15.00 to $19.99 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	$ 15.00
Options exercisable, weighted average price (per share)	15.00
United States of America, Dollars | $15.00 to $19.99 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, weighted average price (per share)	19.99
Options exercisable, weighted average price (per share)	$ 19.99

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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