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CONDENSED CONSOLIDATED INCOME STATEMENTS (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
CONDENSED CONSOLIDATED INCOME STATEMENTS (unaudited)    
Revenues $ 99,476 $ 88,171
Costs of services (exclusive of depreciation and amortization) 69,391 62,581
Selling, general and administrative expenses 21,650 18,716
Depreciation and amortization 2,231 1,963
Income from operations 6,204 4,911
Interest expense, net (37) (112)
Other expense, net (241) (191)
Income before provision for income taxes 5,926 4,608
Provision for income taxes 1,040 1,778
Net income 4,886 2,830
Net loss attributable to noncontrolling interest, net of tax   23
Net income attributable to CRA International, Inc. $ 4,886 $ 2,853
Net income per share attributable to CRA International, Inc.:    
Basic (in dollars per share) $ 0.59 $ 0.34
Diluted (in dollars per share) $ 0.57 $ 0.33
Weighted average number of shares outstanding:    
Basic (in shares) 8,285 8,419
Diluted (in shares) 8,580 8,621
Dividends per share $ 0.17 $ 0.14