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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Income Statement [Abstract]
Revenue from services	$ 458,706	$ 494,252
Cost of services	348,132	368,093
Gross profit	110,574	126,159
Selling, general and administrative expense	97,401	117,381
Depreciation and amortization	6,962	9,094
Goodwill and intangible asset impairment charge	0	175,189
Income (loss) from operations	6,211	(175,505)
Interest and other income (expense), net	575	263
Income (loss) before tax expense (benefit)	6,786	(175,242)
Income tax expense (benefit)	(112)	(24,748)
Net income (loss)	$ 6,898	$ (150,494)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.20	$ (4.04)
Diluted (in dollars per share)	$ 0.20	$ (4.04)
Weighted average shares outstanding:
Basic (in shares)	34,674	37,255
Diluted (in shares)	35,066	37,255
Other Comprehensive Income (Loss):
Foreign currency translation adjustment	$ 496	$ (6,625)
Comprehensive income (loss)	$ 7,394	$ (157,119)

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