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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 3) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Maximum | Dec. 31, 2011 Maximum | Dec. 31, 2010 Maximum | Dec. 31, 2012 Accounts receivable securitization program | Dec. 31, 2012 Letter of Credit Agreements | Dec. 31, 2011 Letter of Credit Agreements | Dec. 31, 2012 Surety bonds | Dec. 31, 2011 Surety bonds | Dec. 31, 2012 Credit Agreement | Dec. 31, 2012 Revolving commitments | Jun. 15, 2012 Term Loan | Dec. 31, 2012 Notes payable | Dec. 31, 2012 Notes payable Revenue Equipment ABF | Dec. 31, 2011 Notes payable Revenue Equipment ABF | Dec. 31, 2012 Capital lease obligations | Dec. 31, 2011 Capital lease obligations Revenue Equipment ABF | Dec. 31, 2010 Capital lease obligations Revenue Equipment ABF | Dec. 31, 2010 Capital lease obligations Total Equipment ABF
Financing Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 36 months | 36 months |  |  |  |
Term of capital lease agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 months | 36 months |
Term of first additional capital lease agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 months
Term of second additional capital lease agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 months
Revenue equipment financed during the period under notes payable or capital lease agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000,000 | $ 28,500,000 |  | $ 1,900,000 | $ 11,400,000 | $ 36,300,000
Weighted-average interest rate (as a percent) | 2.60% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  | 4.50% |  |  |
Interest paid, net of capitalized interest | 4,500,000 | 3,300,000 | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  | 100,000 | 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of term loan |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio required to be maintained |  |  |  |  |  |  |  |  |  |  |  | 1.25 |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  | 16,200,000 | 22,700,000 | 46,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding surety bonds under collateralized bond program |  |  |  |  |  |  |  |  |  | 13,800,000 | 13,800,000 |  |  |  |  |  |  |  |  |  |
Amounts collateralized by restricted funds | 9,658,000 | 52,693,000 |  |  |  |  |  | 5,900,000 | 45,700,000 | 3,800,000 | 7,000,000 |  |  |  |  |  |  |  |  |  |
Reduction in amounts collateralized by restricted funds under letters of credit transferred to uncollateralized bond programs |  |  |  |  |  |  |  | 26,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding surety bonds under uncollateralized bond programs |  |  |  |  |  |  |  |  |  | 36,600,000 |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  | 58,800,000 | 69,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Period prior to expiration of the collective bargaining agreement upon which the available liquidity requirement is triggered if no new agreement is in place |  |  |  |  |  |  | 7 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available liquidity required to be maintained if new collective bargaining agreement is not in place seven days prior to expiration of current agreement |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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