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Non-cash operating items
 6 Months Ended
Jun. 30, 2020
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:
 
Three months ended June 30
 
Six months ended June 30
 
2020
 
2019
 
2020
 
2019
Accounts receivable
$
50,264

 
$
40,396

 
$
56,946

 
$
11,721

Fuel and natural gas in storage
(7,951
)
 
(9,420
)
 
3,059

 
10,061

Supplies and consumables inventory
(13,164
)
 
(2,944
)
 
(20,958
)
 
(4,921
)
Income taxes recoverable
(1,270
)
 
7,623

 
(1,889
)
 
6,801

Prepaid expenses
3,104

 
1,138

 
(7,344
)
 
(5,468
)
Accounts payable
7,833

 
18,429

 
(63,337
)
 
(10,108
)
Accrued liabilities
(4,472
)
 
(44,475
)
 
(40,039
)
 
(54,969
)
Current income tax liability
(2,379
)
 
(5,657
)
 
1,716

 
694

Asset retirements and environmental obligations
(127
)
 
(322
)
 
(699
)
 
(1,422
)
Net regulatory assets and liabilities
20,731

 
2,007

 
15,916

 
8,124

 
$
52,569

 
$
6,775

 
$
(56,629
)
 
$
(39,487
)