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Accounts receivable | 12 Months Ended
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Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] |
Accounts receivable | Accounts receivable Accounts receivable as of December 31, 2017 include unbilled revenue of $98,214 (2016 - $57,822) from the Company’s regulated utilities. Accounts receivable as of December 31, 2017 are presented net of allowance for doubtful accounts of $6,968 (2016 - $7,064).

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