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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (LOSS) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Revenue from services $ 2,499,207 $ 2,508,771 $ 2,750,640
Cost of services 1,833,607 1,874,298 2,070,922
Gross profit 665,600 634,473 679,718
Selling, general and administrative expense 550,632 510,794 546,477
Depreciation and amortization 41,049 46,115 46,692
Goodwill and intangible asset impairment charge 0 0 103,544
Income (loss) from operations 73,919 77,564 (16,995)
Interest expense (4,881) (5,494) (7,166)
Interest and other income 6,625 5,480 3,821
Interest and other income (expense), net 1,744 (14) (3,345)
Income (loss) before tax expense (benefit) 75,663 77,550 (20,340)
Income tax expense (benefit) 9,909 22,094 (5,089)
Net income (loss) $ 65,754 $ 55,456 $ (15,251)
Net income (loss) per common share:      
Basic (in dollars per share) $ 1.64 $ 1.35 $ (0.37)
Diluted (in dollars per share) $ 1.63 $ 1.34 $ (0.37)
Weighted average shares outstanding:      
Basic (in shares) 39,985 41,202 41,648
Diluted (in shares) 40,275 41,441 41,648
Other comprehensive income (loss):      
Total other comprehensive income (loss), net of tax $ (6,320) $ 4,629 $ 2,580
Comprehensive income (loss) 59,434 60,085 (12,671)
Foreign currency translation adjustment      
Other comprehensive income (loss):      
Foreign currency translation adjustment, net of tax (6,320) 3,355 1,830
Unrealized gain on investments, net of tax      
Other comprehensive income (loss):      
Unrealized gain on investments, net of tax $ 0 $ 1,274 $ 750