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GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) | 3 Months Ended |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Trade name | Mar. 31, 2013 Other | Mar. 31, 2013 Customer relationships | Mar. 31, 2013 Driver network | Mar. 31, 2013 Panther Expedited Services, Inc. Minimum | Mar. 31, 2013 Panther Expedited Services, Inc. Maximum | Dec. 31, 2013 Panther Expedited Services, Inc. Forecast
Finite-lived intangible assets |  |  |  |  |  |  |  |  |
Weighted Average Amortization Period | 13 years |  |  |  | 14 years | 3 years |  |  |
Cost | $ 46,700,000 |  |  |  | $ 43,500,000 | $ 3,200,000 |  |  |
Accumulated Amortization | 3,304,000 |  |  |  | 2,460,000 | 844,000 |  |  |
Net Value | 43,396,000 |  |  |  | 41,040,000 | 2,356,000 |  |  |
Indefinite-lived intangible assets |  |  |  |  |  |  |  |  |
Net Value | 35,122,000 |  | 32,300,000 | 2,822,000 |  |  |  |  |
Total intangible assets |  |  |  |  |  |  |  |  |
Cost | 81,822,000 |  |  |  |  |  |  |  |
Net Value | 78,518,000 | 79,561,000 |  |  |  |  |  |  |
Amortization expense on intangible assets |  |  |  |  |  |  |  |  |
Intangible amortization expense | 1,043,000 |  |  |  |  |  |  |  | 4,000,000
Annual amortization expense on intangible assets expected for fiscal 2014-2017 |  |  |  |  |  |  | $ 3,000,000 | $ 4,000,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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