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Non-cash operating items
 12 Months Ended
Dec. 31, 2018
Disclosure Changes In Non Cash Operating Items [Abstract]  
Non-cash operating items
Non-cash operating items
The changes in non-cash operating items consist of the following:
 
2018
 
2017
Accounts receivable
$
3,005

 
$
(45,818
)
Fuel and natural gas in storage
1,351

 
(4,385
)
Supplies and consumables inventory
(7,189
)
 
(1,864
)
Income taxes recoverable
(763
)
 
(557
)
Prepaid expenses
2,907

 
(2,755
)
Accounts payable
(22,915
)
 
7,525

Accrued liabilities
28,687

 
14,041

Current income tax liability
2,974

 
(3,190
)
Asset retirements and environmental obligations
(7,293
)
 
(4,372
)
Net regulatory assets and liabilities
(8,890
)
 
(46,344
)
 
$
(8,126
)
 
$
(87,719
)