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RELATED PARTY TRANSACTIONS (Details) (USD $)	12 Months Ended
	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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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amounts due from owners or owners with a beneficial interest of more than 10 percent of the voting interests or officers of the company, which are usually due within 1 year (or 1 business cycle).

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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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.

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