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Non-cash operating items
 6 Months Ended
Jun. 30, 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:
 
Three Months Ended June 30
 
Six Months Ended June 30
 
2019
 
2018
 
2019
 
2018
Accounts receivable
$
40,396

 
$
45,821

 
$
11,721

 
$
29,784

Fuel and natural gas in storage
(9,420
)
 
(6,885
)
 
10,061

 
9,335

Supplies and consumable inventory
(2,944
)
 
(3,397
)
 
(4,921
)
 
(5,344
)
Income taxes recoverable
7,623

 
(2,066
)
 
6,801

 
(2,074
)
Prepaid expenses
1,138

 
7,287

 
(5,468
)
 
4,034

Accounts payable
18,429

 
(10,457
)
 
(10,108
)
 
(50,512
)
Accrued liabilities
(45,581
)
 
(13,833
)
 
(55,711
)
 
(29,316
)
Current income tax liability
(5,657
)
 
2,099

 
694

 
2,789

Asset retirements and environmental obligations
(322
)
 
(5,230
)
 
(1,422
)
 
(5,726
)
Net regulatory assets and liabilities
2,007

 
9,638

 
8,124

 
7,039

 
$
5,669

 
$
22,977

 
$
(40,229
)
 
$
(39,991
)