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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Revenue from services $ 554,388 $ 568,244
Cost of services 411,120 428,815
Gross profit 143,268 139,429
Selling, general and administrative expense 125,763 121,844
Depreciation and amortization 10,090 11,174
Income from operations 7,415 6,411
Interest expense (890) (1,232)
Interest and other income 3,094 1,306
Interest and other income (expense), net 2,204 74
Income before tax expense 9,619 6,485
Income tax expense 864 1,811
Net income $ 8,755 $ 4,674
Net income per common share:    
Basic (in dollars per share) $ 0.22 $ 0.11
Diluted (in dollars per share) $ 0.22 $ 0.11
Weighted average shares outstanding:    
Basic (in shares) 40,443 41,637
Diluted (in shares) 40,694 41,937
Other comprehensive income:    
Total other comprehensive income (loss), net of tax $ (1,384) $ 2,537
Comprehensive income 7,371 7,211
Foreign currency translation adjustment    
Other comprehensive income:    
Foreign currency translation adjustment (1,384) 1,800
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Other comprehensive income:    
Unrealized gain on investments, net of tax $ 0 $ 737