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SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2017 CAD ($)
Stock options
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	4 years
RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
RSUs | Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2 years 6 months
RSUs | Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
DSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Minimum required annual retainer (as percent)	75.00%
PRSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
PRSUs | Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage (as percent)	0.00%
PRSUs | Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage (as percent)	200.00%
PGSUs | Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage (as percent)	100.00%
PGSUs | Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage (as percent)	600.00%
ESPP
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	1 year
Employer matching contribution (as percent)	50.00%
Maximum employer contribution	$ 5,000
ESPP | Minimum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Annual contributions per employee (as percent)	1.00%
ESPP | Maximum
Disclosure of terms and conditions of share-based payment arrangement [line items]
Annual contributions per employee (as percent)	6.00%

X

- Definition

Share-based compensation arrangement by share-based payment award, minimum amount of required annual retainer available for election

+ References

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X

- Definition

Share-based payment arrangement, annual contributions per employee, percent

+ References

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+ Details

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- Definition

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- Definition

Share-based payment arrangement, employer matching contribution, percent of match

+ References

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X

- Definition

Vesting percentage for share-based payment arrangement

+ References

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- Definition

Vesting requirements for share-based Ppment arrangement

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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