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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Revenues:        
Revenues before reimbursements $ 84,120 $ 73,334 $ 164,587 $ 152,284
Reimbursements 3,720 3,961 7,375 8,167
Revenues 87,840 77,295 171,962 160,451
Operating expenses:        
Compensation and related expenses 51,536 47,040 105,954 99,057
Other operating expenses 7,275 7,218 14,466 14,201
Reimbursable expenses 3,720 3,961 7,375 8,167
General and administrative expenses 4,992 4,145 9,216 7,659
Total operating expenses 67,523 62,364 137,011 129,084
Operating income 20,317 14,931 34,951 31,367
Other income, net:        
Interest income, net 266 171 500 310
Miscellaneous income, net 1,765 1,575 4,307 2,734
Total other income, net 2,031 1,746 4,807 3,044
Income before income taxes 22,348 16,677 39,758 34,411
Income taxes 8,557 6,224 9,391 8,608
Net income $ 13,791 $ 10,453 $ 30,367 $ 25,803
Net income per share:        
Basic $ 0.52 $ 0.39 $ 1.15 $ 0.97
Diluted $ 0.51 $ 0.38 $ 1.13 $ 0.95
Shares used in per share computations:        
Basic 26,415 26,631 26,358 26,572
Diluted 26,968 27,264 26,980 27,256
Cash dividends declared per common share $ 0.21 $ 0.18 $ 0.42 $ 0.36