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Stock-based compensation - Plan activity (Details) (CAD)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (options)	(295,230)		(1,920)
Share option plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (options)	3,029,734		1,864,434
Granted (options)	177,400		1,517,400
Exercised (options)	(295,230)	[1]	(1,920)	[1]
Forfeited (options)	(698,624)		(350,180)
Ending balance (options)	2,213,280		3,029,734
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance (CAD per share)	5.70		8.78
Granted (CAD per share)	5.91		2.83
Exercised (CAD per share)	(3.98)	[1]	(3.69)	[1]
Forfeited (CAD per share)	(7.12)		(9.65)
Ending balance (CAD per share)	5.51		5.70
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Number of options granted	177,400		1,517,400
Weighted average fair value per option granted (CAD per share)	3.73		1.88
Share option plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility	69.11%		74.52%
Risk-free interest rate	1.91%		1.02%
Expected life (years)	6 years 2 months 12 days		6 years 4 months 24 days
Senior executive stock option plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (options)	550,000		550,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Number of options granted	550,000		550,000
Weighted average fair value per option granted (CAD per share)	1.71		1.08
Senior executive stock option plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility	39.12%		72.78%
Risk-free interest rate	0.22%		0.29%
Expected life (years)	1 year 4 months 24 days		2 years 4 months 24 days
Restricted share unit plan | Restricted share units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (units)	1,110,275		1,209,832
Granted (units)	555,204		625,405
Settled (units)	(154,330)		(345,679)
Forfeited (units)	(487,205)		(379,283)
Ending balance (units)	1,023,944		1,110,275
Directors' deferred share unit plan | Deferred stock units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (units)	625,156		421,749
Granted (units)	141,509		266,820
Settled (units)	(179,831)		(63,413)
Ending balance (units)	586,834		625,156
[1] All stock options exercised resulted in new common shares being issued (note 18(a))

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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