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Non-cash operating items
 12 Months Ended
Dec. 31, 2017
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:
 
2017
 
2016
Accounts receivable
$
(18,502
)
 
$
6,612

Fuel and natural gas in storage
(1,970
)
 
6,877

Supplies and consumable inventory
1,392

 
692

Income taxes receivable
1,674

 
145

Prepaid expenses
(897
)
 
(6,161
)
Accounts payable
(23,178
)
 
24,524

Accrued liabilities
25,122

 
(9,454
)
Current income tax liability
(3,432
)
 
(4,552
)
Net regulatory assets and liabilities
(54,235
)
 
(14,979
)
 
$
(74,026
)
 
$
3,704