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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |
NET INCOME (LOSS) |  |  |  |  | $ 1,404 | $ 12,265 | $ 5,451 | $ (12,787) | $ (7,732) | $ 6,333 | $ (32,421)
LESS: NONCONTROLLING INTEREST IN NET INCOME OF SUBSIDIARY |  |  |  |  |  |  | 153 | 21 |  | 174 | 272
NET INCOME (LOSS) ATTRIBUTABLE TO ARKANSAS BEST CORPORATION | (7,929) | 6,518 | 11,841 | (18,162) | 1,404 | 12,265 | 5,298 | (12,808) | (7,732) | 6,159 | (32,693)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax |  |  |  |  |  |  |  |  |  |  |
Change in foreign currency translation |  |  |  |  |  |  |  |  | 19 | (108) | 76
Unrecognized net actuarial gain (loss) |  |  |  |  |  |  |  |  | (5,830) | (27,178) | 3,064
Amortization of unrecognized net periodic benefit costs: |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  |  |  |  |  | 6,957 | 4,497 | 4,819
Prior service credit |  |  |  |  |  |  |  |  | (116) | (115) | (4)
Net transition obligation |  |  |  |  |  |  |  |  |  |  | 82
Pension settlement expense |  |  |  |  |  |  |  |  |  | 687 | 109
Other |  |  |  |  |  |  |  |  |  | (132) | 13
OTHER COMPREHENSIVE INCOME (LOSS), net of tax |  |  |  |  |  |  |  |  | 1,030 | (22,349) | 8,159
COMPREHENSIVE LOSS ATTRIBUTABLE TO ARKANSAS BEST CORPORATION |  |  |  |  |  |  |  |  | $ (6,702) | $ (16,190) | $ (24,534)

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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e557-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A + Details
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