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NET EARNINGS (LOSS) PER COMMON SHARE (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings per share [abstract]  
Net earnings (loss) per common share
 
 
 
2017

 
2016

 
2015

Weighted average common shares outstanding
– basic (thousands of shares)
 
1,175,094

 
1,100,471

 
1,093,862

Effect of dilutive stock options (thousands of shares)
 
7,729

 
—

 
—

Weighted average common shares outstanding
– diluted (thousands of shares)
 
1,182,823

 
1,100,471

 
1,093,862

Net earnings (loss)
 
$
2,397

 
$
(204
)
 
$
(637
)
Net earnings (loss) per common share
– basic
 
$
2.04

 
$
(0.19
)
 
$
(0.58
)
 
– diluted
 
$
2.03

 
$
(0.19
)
 
$
(0.58
)