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Non-cash operating items (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure Changes In Non Cash Operating Items [Abstract]  
Changes in Non-Cash Operating Items
The changes in non-cash operating items consist of the following:
 
2015
 
2014
Accounts receivable
$
6,715

 
$
(23,640
)
Natural gas in storage
3,049

 
(5,942
)
Supplies and consumable inventory
(2,968
)
 
(3,861
)
Income taxes receivable
(2,529
)
 
(189
)
Prepaid expenses
(7,833
)
 
827

Accounts payable
(18,261
)
 
54,299

Accrued liabilities
(28,495
)
 
32,520

Current income tax liability
1,820

 
(1,527
)
Net regulatory assets and liabilities
37,353

 
(54,277
)
 
$
(11,149
)
 
$
(1,790
)