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ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |
Accrued compensation | $ 22,734 | $ 15,841
Accrued vacation pay | 36,246 | 40,473
Taxes other than income | 7,418 | 7,366
Workers' compensation, third-party casualty, and loss and damage claims reserves | 92,166 | 86,969
Other | 15,058 | 8,019
Total accrued expenses | $ 173,622 | $ 158,668

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