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GOODWILL AND INTANGIBLE ASSETS (Details 3) (Panther Expedited Services, Inc., Software, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Panther Expedited Services, Inc. | Software |  |
Property, Plant and Equipment |  |
Amortization period | 7 years |
Amortization expense | $ 4.5 | $ 2.5
Annual amortization expense on acquired software expected for fiscal 2013-2018 | $ 4.5 |

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