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INCOME TAXES (Details 4) (USD $) | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 State | Jun. 15, 2012 State Panther Expedited Services, Inc. | Dec. 31, 2013 State Minimum | Jun. 15, 2012 State Minimum Panther Expedited Services, Inc. | Dec. 31, 2013 State Maximum | Jun. 15, 2012 State Maximum Panther Expedited Services, Inc. | Dec. 31, 2013 Foreign | Dec. 31, 2013 Foreign Minimum | Dec. 31, 2013 Foreign Maximum | Jun. 15, 2012 Federal Panther Expedited Services, Inc. | Dec. 31, 2013 State Operating Losses and Deferred Tax Assets
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes paid before income tax refunds | $ 13,400,000 | $ 5,300,000 | $ 5,200,000 |  |  |  |  |  |  |  |  |  |  |
Income tax refunds | 8,100,000 | 7,100,000 | 4,600,000 |  |  |  |  |  |  |  |  |  |  |
Operating loss and contribution carryforwards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  | 87,500,000 | 18,500,000 |  |  |  |  |  |  |  | 14,800,000 |
Contribution carryforwards |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |
State net operating loss and contribution carryforwards expiration period |  |  |  |  |  | 5 years |  | 20 years |  |  |  |  |  |
Majority of state net operating loss and contribution carryforwards, expiration period one |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Majority of state net operating loss and contribution carryforwards, expiration period two |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Valuation allowance | 1,028,000 | 2,511,000 |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance related tax credit carryforwards |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |
Valuation allowance related to net operating loss carryforwards |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |
Foreign tax credit carryforwards, expiration period |  |  |  |  |  |  |  |  |  |  | 6 years | 10 years |  |
Change in valuation allowance | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000
Net operating loss carryforwards expiration period |  |  |  |  |  |  | 5 years |  | 20 years |  |  |  | 18 years |

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