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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Revenue:    
Revenue before reimbursements $ 67,475 $ 65,069
Reimbursements 5,258 6,360
Total revenue 72,733 71,429
Cost of service:    
Personnel costs before reimbursable expenses (includes $1,843 and $1,442 of stock compensation expense in the quarters ended March 30, 2018 and March 31, 2017, respectively) 42,879 41,594
Reimbursable expenses 5,258 6,360
Total cost of service 48,137 47,954
Selling, general and administrative costs (includes $841 and $659 of stock compensation expense in the quarters ended March 30, 2018 and March 31, 2017, respectively) 16,276 15,511
Total costs and operating expenses 64,413 63,465
Income from operations 8,320 7,964
Other expense:    
Interest expense (179) (90)
Income from operations before income taxes 8,141 7,874
Income tax expense 774  
Net income $ 7,367 $ 7,874
Basic net income per common share:    
Income per common share from operations $ 0.25 $ 0.27
Weighted average common shares outstanding 29,089,356 28,867,950
Diluted net income per common share:    
Income per common share from operations $ 0.23 $ 0.24
Weighted average common and common equivalent shares outstanding 31,814,813 32,292,414