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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Workers' Compensation Deductible Limit [Line Items]
Workers' compensation claim deductible limit			$ 2,000
Weighted average period - claim payments below deductible limit			5 years
Payments made against self-insured claims			$ 50,700	$ 48,200
Weighted average period - claim payments and receivables above deductible limit			15 years
Excess claims	$ 49,000		$ 49,000		$ 48,800
Workers' compensation claim receivables net of valuation allowance	45,644		45,644		45,048
Workers Compensation Expense	$ 17,800	$ 22,100	$ 52,200		$ 64,200
Below limit
Workers' Compensation Deductible Limit [Line Items]
Weighted average rate			2.00%		1.80%
Above Limit
Workers' Compensation Deductible Limit [Line Items]
Weighted average rate			2.80%		2.50%

X

- Definition

Discounted workers compensation reserve for excess claims.

+ References

No definition available.

+ Details

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- Definition

Estimated weighted average period in which claim payments are made and reimbursements from insurance carries are received for workers' compensation claims that are above the established deductible limit as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Estimated weighted average period in which claim payments are made for workers' compensation claims that are below the established deductible limit as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount of risk retained by the entity for workers' compensation claims, on a per occurrence basis, before the insurance arrangement begins to provide coverage.

+ References

No definition available.

+ Details

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- Definition

Carrying value as of the balance sheet date of reimbursement receivables from insurance carries pertaining to claims incurred of a workers compensation nature that are above the established deductible limit, net of a valuation allowance for reimbursement receivables that are expected to be uncollectible.

+ References

No definition available.

+ Details

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- Definition

[Line Items] for Workers' Compensation Deductible Limit

+ References

No definition available.

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- Definition

Workers' compensation expense recognized during the period for claims reserves net of changes in discount in non monopolistic jurisdictions; premiums in monopolistic jurisdictions; insurance premiums; changes in the valuation allowance related to receivables from insurance companies; and other miscellaneous expenses.

+ References

No definition available.

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- Definition

Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

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- Definition

The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99384497&loc=d3e14881-158438

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