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Accounting pronouncements recently adopted Accounting pronouncements recently adopted (Details) - CAD CAD in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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New Accounting Pronouncement, Early Adoption [Line Items] |  |
Deferred tax asset | CAD 15,845 | CAD 35,556
Deferred tax liability | CAD 42,308 | 62,133
New Accounting Pronouncement, Early Adoption, Effect |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Deferred tax asset |  | 5,600
Current deferred tax assets |  | 5,600
Current deferred tax liabilities |  | 20,100
Deferred tax liability |  | CAD 20,100

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