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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE 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
Revenue from services $ 451,169 $ 379,467 $ 1,219,977 $ 1,044,915
Cost of services 327,641 274,237 897,937 766,914
Gross profit 123,528 105,230 322,040 278,001
Selling, general and administrative expenses 90,767 77,634 268,538 221,243
Depreciation and amortization 4,771 4,660 15,133 14,156
Income from operations 27,990 22,936 38,369 42,602
Interest expense (350) (266) (919) (900)
Interest and other income 766 675 2,086 1,986
Interest and other income, net 416 409 1,167 1,086
Income before tax expense 28,406 23,345 39,536 43,688
Income tax expense 9,454 8,998 9,124 17,474
Net income 18,952 14,347 30,412 26,214
Net income per common share:        
Basic (in dollars per share) $ 0.47 $ 0.36 $ 0.76 $ 0.66
Diluted (in dollars per share) $ 0.47 $ 0.36 $ 0.75 $ 0.66
Weighted average shares outstanding:        
Basic (in shares) 40,330 39,516 40,085 39,547
Diluted (in shares) 40,670 39,858 40,395 39,841
Total other comprehensive income (loss), net of tax 79 [1] 504 [1] (476) [1] 372 [1]
Comprehensive income $ 19,031 $ 14,851 $ 29,936 $ 26,586
[1] The tax impact of the components of other comprehensive income were immaterial.