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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Apr. 01, 2022
Revenues:    
Revenues before reimbursements $ 128,705 $ 117,870
Reimbursements 11,604 10,608
Revenues 140,309 128,478
Operating expenses:    
Compensation and related expenses 84,181 68,757
Other operating expenses 9,561 8,165
Reimbursable expenses 11,604 10,608
General and administrative expenses 5,843 4,231
Total operating expenses 111,189 91,761
Operating income 29,120 36,717
Other income, net:    
Interest income, net 1,770 21
Miscellaneous income (loss), net 4,648 (3,931)
Total other income (loss), net 6,418 (3,910)
Income before income taxes 35,538 32,807
Income taxes 6,414 3,198
Net income $ 29,124 $ 29,609
Net income per share:    
Basic (in dollars per share) $ 0.57 $ 0.56
Diluted (in dollars per share) $ 0.56 $ 0.56
Shares used in per share computations:    
Basic (in shares) 51,132 52,419
Diluted (in shares) 51,682 53,039
Cash dividends declared per common share (in dollars per share) $ 0.26 $ 0.24