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ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ACCRUED EXPENSES
Workers' compensation, third-party casualty, and loss and damage claims reserves	$ 96,183us-gaap_SelfInsuranceReserveCurrent	$ 92,166us-gaap_SelfInsuranceReserveCurrent
Accrued compensation	35,305us-gaap_AccruedSalariesCurrent	22,734us-gaap_AccruedSalariesCurrent
Accrued vacation pay	33,029us-gaap_AccruedVacationCurrent	36,246us-gaap_AccruedVacationCurrent
Taxes other than income	8,022us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent	7,418us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Other	22,135us-gaap_OtherAccruedLiabilitiesCurrent	15,058us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses	$ 194,674us-gaap_AccruedLiabilitiesCurrent	$ 173,622us-gaap_AccruedLiabilitiesCurrent

X

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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-Publisher FASB

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-SubTopic 30

-Section 45

-Paragraph 1

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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-Publisher FASB

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- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for unused vacation time owed to employees based on the entity's vacation benefit given to its employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).

+ References

No definition available.

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