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ACQUISITIONS (SIMOS Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Dec. 01, 2015 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 25, 2015
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Contingent consideration |  | $ 0 | $ 21,600 |
Goodwill |  | $ 226,694 | $ 224,223 | $ 268,495
SIMOS Insourcing Solutions Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 66,603 |  |  |
Contingent consideration | 18,300 |  |  |
Total consideration | 84,903 |  |  |
Accounts receivable | 19,207 |  |  |
Prepaid expenses, deposits and other current assets | 461 |  |  |
Property and equipment | 464 |  |  |
Estimated fair value | 39,900 |  |  |
Restricted cash | 4,277 |  |  |
Other non-current assets | 2,439 |  |  |
Total assets acquired | 66,748 |  |  |
Accounts payable and other accrued expenses | 3,741 |  |  |
Accrued wages and benefits | 4,075 |  |  |
Workers’ compensation liability | 8,520 |  |  |
Total liabilities assumed | 16,336 |  |  |
Net identifiable assets acquired | 50,412 |  |  |
Goodwill | 34,491 |  |  |
Acquired receivables | 19,300 |  |  |
Acquired receivables, estimated uncollectible | $ 100 |  |  |
Goodwill, expected tax deductible amount, Period | 15 years |  |  |
Customer relationships | SIMOS Insourcing Solutions Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated fair value | $ 39,000 |  |  |
Trade name/trademarks | SIMOS Insourcing Solutions Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated fair value | 800 |  |  |
Technologies | SIMOS Insourcing Solutions Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated fair value | $ 100 |  |  |

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