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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Schedule of computation of basic and diluted earnings (loss) 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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