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Capital lease obligations (Details) - CAD CAD in Thousands	Dec. 31, 2017	Dec. 31, 2016
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	CAD 31,530
2019	20,696
2020	12,182
2021	4,892
2022	2,192
Subtotal:	71,492
Less: amount representing interest (at rates ranging from 2.75% to 7.51%)	(4,523)
Carrying amount of minimum lease payments	66,969
Less: current portion	(29,136)	CAD (24,062)
Long term portion	CAD 37,833	CAD 37,338
Minimum
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease interest rate	2.75%
Maximum
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease interest rate	7.51%

X

- Definition

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 1
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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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The percentage points added to the reference rate to compute the variable rate on the lessee's capital lease.

+ References

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