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Non-cash operating items
 12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015
Accounts receivable
$
6,612

 
$
6,715

Natural gas in storage
6,877

 
3,049

Supplies and consumable inventory
692

 
(2,968
)
Income taxes receivable
145

 
(2,529
)
Prepaid expenses
(6,161
)
 
(7,833
)
Accounts payable
24,524

 
(18,261
)
Accrued liabilities
(9,454
)
 
(28,495
)
Current income tax liability
(4,552
)
 
1,820

Net regulatory assets and liabilities
(14,979
)
 
37,353

 
$
3,704

 
$
(11,149
)