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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2012
Jul. 01, 2011
Jun. 29, 2012
Jul. 01, 2011
Revenue from services $ 354,261 $ 320,179 $ 665,448 $ 594,478
Cost of services 260,725 234,847 492,677 439,115
Gross profit 93,536 85,332 172,771 155,363
Selling, general and administrative expenses 71,526 67,677 143,610 132,837
Depreciation and amortization 4,729 3,862 9,496 7,784
Income from operations 17,281 13,793 19,665 14,742
Interest expense (244) (415) (635) (688)
Interest and other income 656 581 1,312 1,162
Interest and other income, net 412 166 677 474
Income before tax expense 17,693 13,959 20,342 15,216
Income tax expense 7,356 5,411 8,475 5,903
Net income 10,337 8,548 11,867 9,313
Net income per common share:        
Basic (in dollars per share) $ 0.26 $ 0.20 $ 0.30 $ 0.21
Diluted (in dollars per share) $ 0.26 $ 0.20 $ 0.30 $ 0.21
Weighted average shares outstanding:        
Basic (in shares) 39,701 43,367 39,563 43,413
Diluted (in shares) 40,097 43,674 39,993 43,784
Comprehensive income $ 9,943 $ 8,585 $ 11,735 $ 9,608