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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 01, 2015 | Jan. 02, 2015 | Apr. 30, 2014
Goodwill by reportable operating segment |  |  |  |  |
Balance at the beginning of the period | $ 77,078 | $ 76,448 |  |  |
Goodwill acquired | 19,387 | 630 |  |  |
Balance at the end of the period | 96,465 | 77,078 |  |  |
Impairment of goodwill balances | 0 | 0 |  |  |
Premium Logistics (Panther) |  |  |  |  |
Goodwill by reportable operating segment |  |  |  |  |
Balance at the beginning of the period | 71,096 | 71,096 |  |  |
Balance at the end of the period | 71,096 | 71,096 |  |  |
Household Goods Moving Services (ABF Moving) |  |  |  |  |
Goodwill by reportable operating segment |  |  |  |  |
Balance at the beginning of the period | 5,352 | 5,352 |  |  |
Balance at the end of the period | 5,352 | 5,352 |  |  |
Transportation Management (ABF Logistics) |  |  |  |  |
Goodwill by reportable operating segment |  |  |  |  |
Goodwill acquired | 19,387 |  |  |  |
Balance at the end of the period | 19,387 |  |  |  |
Emergency & Preventative Maintenance (FleetNet) |  |  |  |  |
Goodwill by reportable operating segment |  |  |  |  |
Balance at the beginning of the period | 630 |  |  |  |
Goodwill acquired |  | 630 |  |  |
Balance at the end of the period | $ 630 | $ 630 |  |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  |  |  | $ 600
Smart Lines Transportation Group, LLC | Transportation Management (ABF Logistics) |  |  |  |  |
Goodwill by reportable operating segment |  |  |  |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  |  | $ 4,200 |
Bear Transportation Services, L.P. | Transportation Management (ABF Logistics) |  |  |  |  |
Goodwill by reportable operating segment |  |  |  |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  | $ 15,200 |  |

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