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Financial instruments and risk management - Derivatives (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivative Liabilities [Abstract]
Less: current portion	0	(3,586)
Derivative liabilities, noncurrent	0	2,965
Unrealized Gain (Loss) on Derivatives and Commodity Contracts [Abstract]
Unrealized (gain) loss on embedded price escalation features in certain long term supplier contracts	(6,551)	(4,017)
Not designated as hedging instrument | Supplier contracts | Embedded price escalation features
Unrealized Gain (Loss) on Derivatives and Commodity Contracts [Abstract]
Unrealized (gain) loss on embedded price escalation features in certain long term supplier contracts	(6,551)	(4,017)
Not designated as hedging instrument | Level 2 | Measured on recurring basis | Supplier contracts | Embedded price escalation features
Derivative Liabilities [Abstract]
Embedded price escalation features in certain long term supplier contracts		6,551
Less: current portion		(3,586)
Derivative liabilities, noncurrent		2,965

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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