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RELATED PARTY TRANSACTIONS (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Maintenance Performed And Charges Paid To Third Parties On Behalf Of Their Affiliate And Charged Back [Member] |  |  |
Type of Expense [Line Items] |  |  |
Due from major stockholders | $ 216,000 |  |
Major Shareholder [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | 3,298,000 | 3,011,000 | 5,800,000
Operating expenses with related party | 1,313,000 | 1,316,000 | 830,000
Type of Expense [Line Items] |  |  |
Due from major stockholders | 1,822,000 | 1,271,000 |
Accounts payable, related parties | 564,000 | 554,000 |
Major Shareholder [Member] | Freight Transportation [Member] |  |  |
Type of Expense [Line Items] |  |  |
Due from major stockholders | 1,501,000 |  |
Major Shareholder [Member] | Property Lease Charges [Member] |  |  |
Type of Expense [Line Items] |  |  |
Due from major stockholders | 92,000 |  |
Major Shareholder [Member] | Cross Border Inspections [Member] |  |  |
Type of Expense [Line Items] |  |  |
Due from major stockholders | 12,000 |  |
Major Shareholder [Member] | Auto Liability [Member] |  |  |
Type of Expense [Line Items] |  |  |
Insurance premiums from related party | 9,235,000 | 8,947,000 | 8,831,000
Major Shareholder [Member] | Physical Damage Insurance [Member] |  |  |
Type of Expense [Line Items] |  |  |
Insurance premiums from related party | 1,590,000 | 1,536,000 | 1,696,000
Major Shareholder [Member] | General Liability Insurance [Member] |  |  |
Type of Expense [Line Items] |  |  |
Insurance premiums from related party | 22,000 | 22,000 | 22,000
Major Shareholder [Member] | Workers Compensation Insurance [Member] |  |  |
Type of Expense [Line Items] |  |  |
Insurance premiums from related party | $ 84,000 |  |

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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