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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Revenue from services $ 453,227 $ 422,310 $ 849,290 $ 768,809
Cost of services 333,644 310,437 630,148 570,296
Gross profit 119,583 111,873 219,142 198,513
Selling, general and administrative expenses 96,354 89,339 188,336 177,771
Depreciation and amortization 5,247 5,203 10,408 10,362
Income from operations 17,982 17,331 20,398 10,380
Interest expense (322) (336) (585) (569)
Interest and other income 772 611 1,379 1,321
Interest and other income, net 450 275 794 752
Income before tax expense (benefit) 18,432 17,606 21,192 11,132
Income tax expense (benefit) 2,350 5,069 3,453 (330)
Net income 16,082 12,537 17,739 11,462
Net income per common share:        
Basic (in dollars per share) $ 0.39 $ 0.31 $ 0.44 $ 0.29
Diluted (in dollars per share) $ 0.39 $ 0.31 $ 0.43 $ 0.28
Weighted average shares outstanding:        
Basic (in shares) 40,739 40,140 40,655 39,962
Diluted (in shares) 40,969 40,421 40,934 40,248
Other comprehensive income (loss):        
Foreign currency translation adjustment, net of tax 333 (325) 89 (549)
Unrealized gain (loss) on investments, net of tax 406 71 453 (7)
Total other comprehensive income (loss), net of tax 739 (254) 542 (556)
Comprehensive income $ 16,821 $ 12,283 $ 18,281 $ 10,906