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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE
 
The following table sets forth the computation of basic and diluted earnings (loss) per share for the years ended December 31:
 
 
2013

2012

2011
 
(in thousands, except share and per share data)
Basic earnings (loss) per share
 


 


 

Numerator:
 


 


 

Net income (loss) attributable to Arkansas Best Corporation
$
15,811

 
$
(7,732
)
 
$
6,159

Effect of unvested restricted stock awards
(720
)
 
(149
)
 
(249
)
Adjusted net income (loss)
$
15,091

 
$
(7,881
)
 
$
5,910


 
 
 
 
 
Denominator:
 

 
 

 
 

Weighted‑average shares
25,714,205

 
25,564,752

 
25,403,073

Earnings (loss) per common share
$
0.59

 
$
(0.31
)
 
$
0.23


 
 
 
 
 
Diluted earnings (loss) per share
 

 
 

 
 

Numerator:
 

 
 

 
 

Net income (loss) attributable to Arkansas Best Corporation
$
15,811

 
$
(7,732
)
 
$
6,159

Effect of unvested restricted stock awards
(720
)
 
(149
)
 
(249
)
Adjusted net income (loss)
$
15,091

 
$
(7,881
)
 
$
5,910


 
 
 
 
 
Denominator:
 

 
 

 
 

Weighted‑average shares
25,714,205

 
25,564,752

 
25,403,073

Effect of dilutive securities
—

 
—

 
—

Adjusted weighted‑average shares and assumed conversions
25,714,205

 
25,564,752

 
25,403,073

Earnings (loss) per common share
$
0.59

 
$
(0.31
)
 
$
0.23


 
Under the two‑class method of calculating earnings per share, dividends paid and a portion of undistributed net income, but not losses, are allocated to unvested restricted stock and restricted stock units, which are considered participating securities. For the years ended December 31, 2013 and 2011, outstanding stock awards of 0.8 million and 0.9 million, respectively, were not included in the diluted earnings per share calculations because their inclusion would have the effect of increasing the earnings per share. For the year ended December 31, 2012, outstanding stock awards of 0.7 million were not included in the diluted earnings per share calculation because their inclusion would have the effect of decreasing the loss per share.