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TRADE ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2012
TRADE ACCOUNTS RECEIVABLE [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | The Company's receivables result primarily from the sale of transportation and logistics services. The Company performs ongoing credit evaluations of its customers and generally does not require collateral for accounts receivable. Accounts receivable which consist of both billed and unbilled receivables are presented net of an allowance for doubtful accounts. Accounts outstanding longer than contractual payment terms are considered past due and are reviewed individually for collectibility. Accounts receivable balances consist of the following components as of December 31, 2012 and 2011:
|  | 2012 |  |  | 2011 |
|  | (in thousands) |
Billed |  | $ | 44,374 |  |  | $ | 44,370 |
Unbilled |  |  | 6,800 |  |  |  | 5,723 |
Allowance for doubtful accounts |  |  | (1,157 | ) |  |  | (2,074 | )
Total accounts receivable—net |  | $ | 50,017 |  |  | $ | 48,019 |
Allowance for Doubtful Accounts | An analysis of changes in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (in thousands) |
Balance—beginning of year |  | $ | 2,074 |  |  | $ | 2,418 |  |  | $ | 2,660 |
Provision for bad debts |  |  | (285 | ) |  |  | 22 |  |  |  | 529 |
Charge-offs |  |  | (632 | ) |  |  | (565 | ) |  |  | (1,100 | )
Recoveries |  |  | - |  |  |  | 199 |  |  |  | 329 |
Balance—end of year |  | $ | 1,157 |  |  | $ | 2,074 |  |  | $ | 2,418 |

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- Definition Tabular disclosure of the roll forward of the activity in the allowance for doubtful accounts from the beginning of the period to the end of the period. + References No definition available. + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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