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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. 28, 2013
Jun. 29, 2012
Jun. 28, 2013
Jun. 29, 2012
Revenue from services $ 422,310 $ 354,261 $ 768,809 $ 665,448
Cost of services 310,437 260,725 570,296 492,677
Gross profit 111,873 93,536 198,513 172,771
Selling, general and administrative expenses 89,339 71,526 177,771 143,610
Depreciation and amortization 5,203 4,729 10,362 9,496
Income from operations 17,331 17,281 10,380 19,665
Interest expense (336) (244) (569) (635)
Interest and other income 611 656 1,321 1,312
Interest and other income, net 275 412 752 677
Income before tax expense (benefit) 17,606 17,693 11,132 20,342
Income tax expense (benefit) 5,069 7,356 (330) 8,475
Net income 12,537 10,337 11,462 11,867
Net income per common share:        
Basic (in dollars per share) $ 0.31 $ 0.26 $ 0.29 $ 0.30
Diluted (in dollars per share) $ 0.31 $ 0.26 $ 0.28 $ 0.30
Weighted average shares outstanding:        
Basic (in shares) 40,140 39,701 39,962 39,563
Diluted (in shares) 40,421 40,097 40,248 39,993
Total other comprehensive loss, net of tax: (254) [1] (394) [1] (556) [1] (132) [1]
Comprehensive income $ 12,283 $ 9,943 $ 10,906 $ 11,735
[1] The tax impact of the components of other comprehensive income were immaterial.