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Accounts receivable	12 Months Ended
	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Accounts receivable	Accounts receivable Accounts receivable as of December 31, 2018 include unbilled revenue of $79,742 (2017 - $78,289) from the Company’s regulated utilities. Accounts receivable as of December 31, 2018 are presented net of allowance for doubtful accounts of $5,281 (2017 - $5,555).

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