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INCOME TAXES (Details 3) (USD $) | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended |  | 0 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Deferred tax assets for nonunion defined benefit pension liabilities | Dec. 31, 2011 Deferred tax assets for nonunion defined benefit pension liabilities | Jun. 15, 2012 Federal Panther Expedited Services, Inc. | Dec. 31, 2012 Foreign | Dec. 31, 2012 Foreign Minimum | Dec. 31, 2012 Foreign Maximum | Dec. 31, 2012 State | Dec. 31, 2012 State Minimum | Dec. 31, 2012 State Maximum | Dec. 31, 2012 State Net operating loss and deferred tax assets | Jun. 15, 2012 State Panther Expedited Services, Inc. | Jun. 15, 2012 State Panther Expedited Services, Inc. Minimum | Jun. 15, 2012 State Panther Expedited Services, Inc. Maximum
INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes paid before income tax refunds | $ 5,300,000 | $ 5,200,000 | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax refunds | 7,100,000 | 4,600,000 | 35,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss and contribution carryforwards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  | 20,000,000 |  |  |  | 89,900,000 |  |  |  | 16,000,000 |  |
Contribution carryovers |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |
State net operating loss and contribution carryovers expiration period |  |  |  |  |  |  |  |  |  |  | 5 years | 20 years |  |  |  |
Majority of state net operating loss and contribution carryovers, expiration period one |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Majority of state net operating loss and contribution carryovers, expiration period two |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Net operating loss carryovers expiration period |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  | 5 years | 20 years
Valuation allowance | 2,511,000 | 5,644,000 |  |  | 4,000,000 |  |  |  |  |  |  |  | 1,500,000 |  |  |
Valuation allowance related tax credit carryovers |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |
Valuation allowance related to net operating loss carryovers |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |
Foreign tax credit carryovers, expiration period |  |  |  |  |  |  |  | 6 years | 10 years |  |  |  |  |  |  |
Change in valuation allowance | $ (3,200,000) |  |  | $ (4,000,000) |  |  |  |  |  |  |  |  | $ 800,000 |  |  |

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