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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Revenues:        
Revenues before reimbursements $ 70,096 $ 66,725 $ 211,007 $ 201,513
Reimbursements 5,135 6,573 12,389 18,194
Revenues 75,231 73,298 223,396 219,707
Operating expenses:        
Compensation and related expenses 44,801 42,589 137,795 130,621
Other operating expenses 6,440 5,908 18,794 17,422
Reimbursable expenses 5,135 6,573 12,389 18,194
General and administrative expenses 3,695 3,500 10,814 9,565
Total operating expenses 60,071 58,570 179,792 175,802
Operating income 15,160 14,728 43,604 43,905
Other income, net:        
Interest income, net 14 80 95 245
Miscellaneous income, net 2,341 1,522 5,592 3,161
Total other income, net 2,355 1,602 5,687 3,406
Income before income taxes 17,515 16,330 49,291 47,311
Income taxes 6,421 6,105 19,373 18,558
Net income $ 11,094 $ 10,225 $ 29,918 $ 28,753
Net income per share:        
Basic $ 0.82 $ 0.75 $ 2.19 $ 2.08
Diluted $ 0.79 $ 0.72 $ 2.13 $ 2.01
Shares used in per share computations:        
Basic 13,598 13,694 13,638 13,796
Diluted 13,993 14,196 14,047 14,317