Self-Insurance Accruals (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013 Rate	Dec. 31, 2012 Rate
Self-Insurance Accruals [Abstract]
Workers' compensation	$ 35,199	$ 40,450
Present value discount	1,796	2,003
Workers' compensation, net of discount	33,403	38,447
Vehicle liability	4,885	5,117
General liability	18,424	18,169
Total	56,712	61,733
Less current portion	22,057	20,115
Noncurrent portion	34,655	41,618
Loss Contingency Accrual [Roll Forward]
Balance, beginning of year	61,733	57,265
Provision for claims	27,084	29,590
Payment of claims	32,105	25,122
Balance, end of year	$ 56,712	$ 61,733
Workers' compensation discount rate	2.00%	1.90%

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Loss Contingency Accrual, Payment of Claims

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Loss Contingency Accrual, Provision for Claims

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Vehicle Liability

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- Definition

Workers' Compensation, Net of Discount

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Carrying amount (including both current and noncurrent portions) 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.

+ References

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

-Publisher FASB

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-Topic 210

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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).

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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 after one year (or the normal operating cycle, if longer).

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Current year monetary amount of the change in worker's compensation reserve liability resulting from the discount applied to reduce the reserve to present value.

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Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.

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-Number 210

-Section 03

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

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