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Regulatory matters - Approved Annual Revenue Increases (Details) CAD in Thousands, $ in Thousands |  |  |  |  |  |  | 1 Months Ended
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Apr. 12, 2017 USD ($) | Dec. 08, 2016 USD ($) | Nov. 21, 2016 USD ($) | Jun. 30, 2016 USD ($) | Feb. 18, 2016 USD ($) | Feb. 10, 2016 USD ($) | May 31, 2017 CAD | Apr. 30, 2017 USD ($)
New Hampshire Public Utilities Commission |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved revenue increase | $ 6,750 |  |  | $ 6,105 |  |  |  |
Massachusetts Department of Public Utilities |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  |  |  | $ 2,928
Illinois Commerce Commission |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved rate increase | CAD |  |  |  |  |  |  | CAD 2,200 |
Arizona Corporate Commission |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved revenue increase |  |  | $ 1,935 |  | $ 2,725 |  |  |
California Public Utilities Commission |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved revenue increase |  | $ 8,318 |  | 2,175 |  |  |  |
Various |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  | $ 3,551 |  |  |  |
Annual Revenue Increase Approval, March 2016 | Massachusetts Department of Public Utilities |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  | $ 8,300 |  |

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