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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
CONDENSED CONSOLIDATED INCOME STATEMENTS    
Revenues $ 88,171 $ 80,912
Costs of services 62,581 55,515
Gross profit 25,590 25,397
Selling, general and administrative expenses 18,716 19,221
Depreciation and amortization 1,963 1,850
Income from operations 4,911 4,326
Interest expense, net (112) (107)
Other expense, net (191) (34)
Income before provision for income taxes 4,608 4,185
Provision for income taxes (1,778) (1,946)
Net income 2,830 2,239
Net loss attributable to noncontrolling interest, net of tax 23 184
Net income attributable to CRA International, Inc. $ 2,853 $ 2,423
Net income per share attributable to CRA International, Inc.:    
Basic (in dollars per share) $ 0.34 $ 0.27
Diluted (in dollars per share) $ 0.33 $ 0.27
Weighted average number of shares outstanding:    
Basic (in shares) 8,419 8,871
Diluted (in shares) 8,621 8,927