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Business acquisitions and development projects - Acquisition of Empire (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill (note 6) $ 954,282 $ 954,282   $ 228,377
Empire        
Business Acquisition [Line Items]        
Working capital     $ 41,292  
Property, plant and equipment     2,058,867  
Goodwill (note 6)     752,418  
Regulatory assets     236,933  
Other assets     43,609  
Long-term debt     (907,547)  
Regulatory liabilities     (145,594)  
Pension and OPEB     (78,204)  
Deferred income tax liability, net     (418,855)  
Other liabilities     (76,532)  
Total net assets acquired     1,506,387  
Cash and cash equivalents     1,742  
Net assets acquired, net of cash and cash equivalent     $ 1,504,645