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ACQUISITION AND DIVESTITURE TMP (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 12, 2018	Jul. 01, 2018	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Cash purchase price, net of cash acquired					$ 22,742	$ 0
Acquisition-related costs			$ 457	$ 0	457	0
Goodwill		$ 239,380	239,380		239,380		$ 226,694
Revenue from services			$ 614,301	$ 610,122	1,168,689	$ 1,178,366
TMP
Business Acquisition [Line Items]
Cash purchase price, net of cash acquired	$ 22,742
Cash acquired from acquisition	7,000
Acquisition-related costs					$ 500
Accounts receivable	9,770
Prepaid expenses, deposits and other current assets	337
Property and equipment	435
Intangible Assets	8,024
Total assets acquired	18,566
Accounts payable and other accrued expenses	9,139
Accrued wages and benefits	1,642
Income tax payable	205
Deferred income tax liability	1,444
Total liabilities assumed	12,430
Net identifiable assets acquired	6,136
Goodwill	16,606
Revenue from services		$ 2,900
Trade name/trademarks | TMP
Business Acquisition [Line Items]
Intangible Assets	$ 1,738
Estimated useful life in years	14 years
Customer relationships | TMP
Business Acquisition [Line Items]
Intangible Assets	$ 6,286
Minimum | Customer relationships | TMP
Business Acquisition [Line Items]
Estimated useful life in years	3 years
Maximum | Customer relationships | TMP
Business Acquisition [Line Items]
Estimated useful life in years	7 years

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