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Non-cash operating items
 12 Months Ended
Dec. 31, 2019
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:
 
2019
 
2018
Accounts receivable
$
(20,857
)
 
$
3,005

Fuel and natural gas in storage
13,985

 
1,351

Supplies and consumables inventory
(6,028
)
 
(7,189
)
Income taxes recoverable
17,796

 
(763
)
Prepaid expenses
(7,501
)
 
2,907

Accounts payable
63,854

 
(22,915
)
Accrued liabilities
8,872

 
28,687

Current income tax liability
(5,016
)
 
2,974

Asset retirements and environmental obligations
(2,494
)
 
(7,293
)
Net regulatory assets and liabilities
(2,308
)
 
(8,890
)
 
$
60,303

 
$
(8,126
)