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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 25, 2016
Mar. 27, 2015
Revenue from services $ 645,980 $ 573,315
Cost of services 495,468 443,479
Gross profit 150,512 129,836
Selling, general and administrative expenses 130,624 111,593
Depreciation and amortization 11,289 10,520
Income from operations 8,599 7,723
Interest expense (1,969) (1,166)
Interest and other income 950 632
Interest and other expense, net (1,019) (534)
Income before tax expense 7,580 7,189
Income tax expense 612 1,473
Net income $ 6,968 $ 5,716
Net income per common share:    
Basic (in dollars per share) $ 0.17 $ 0.14
Diluted (in dollars per share) $ 0.17 $ 0.14
Weighted average shares outstanding:    
Basic (in shares) 41,502 41,031
Diluted (in shares) 41,798 41,362
Other comprehensive income (loss):    
Total other comprehensive income (loss), net of tax $ 2,477 $ (1,245)
Comprehensive income 9,445 4,471
Foreign currency translation adjustment    
Other comprehensive income (loss):    
Foreign currency translation adjustment, net of tax 2,401 (1,412)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Other comprehensive income (loss):    
Unrealized gain on investments, net of tax $ 76 $ 167