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Revenue - Unpriced contract modifications (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 410,061	$ 292,557
Uncollected consideration	7,526	8,020
Variable consideration - unpriced contract modifications
Disaggregation of Revenue [Line Items]
Revenue	250	1,168
Accounts receivable
Disaggregation of Revenue [Line Items]
Uncollected consideration	0	358
Contract assets
Disaggregation of Revenue [Line Items]
Uncollected consideration	$ 7,526	$ 7,662

X

- Definition

Amount of accumulated credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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+ References

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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