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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Financial Instruments [Abstract]  
Summary of investments
The loss (gain) from the investment in Inter Pipeline was comprised as follows:
 
 
2017

 
2016

 
2015

Fair value loss from Inter Pipeline
 
$
23

 
$
—

 
$
—

Dividend income from Inter Pipeline
 
(10
)
 
(1
)
 
—

 
 
$
13

 
$
(1
)
 
$
—

The (gain) loss from the investment in PrairieSky was comprised as follows:
 
 
2017

 
2016

 
2015

Fair value (gain) loss from PrairieSky
 
$
(3
)
 
$
(292
)
 
$
11

Dividend income from PrairieSky
 
(17
)
 
(27
)
 
(5
)
 
 
$
(20
)
 
$
(319
)
 
$
6

As at December 31, 2017 and 2016, the Company had the following investments:
 
 
2017

 
2016

Investment in PrairieSky Royalty Ltd.
 
$
726

 
$
723

Investment in Inter Pipeline Ltd.
 
167

 
190

 
 
$
893

 
$
913