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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 25, 2015
Dec. 26, 2014
Dec. 27, 2013
Revenue from services $ 2,695,680 $ 2,174,045 $ 1,668,929
Cost of services 2,060,007 1,637,066 1,226,626
Gross profit 635,673 536,979 442,303
Selling, general and administrative expenses 495,988 425,777 362,248
Depreciation and amortization 41,843 29,474 20,472
Income from operations 97,842 81,728 59,583
Interest expense (4,160) (3,156) (1,248)
Interest and other income 2,765 3,272 2,602
Interest and other income (expense), net (1,395) 116 1,354
Income before tax expense 96,447 81,844 60,937
Income tax expense 25,200 16,169 16,013
Net income $ 71,247 $ 65,675 $ 44,924
Net income per common share:      
Basic (in dollars per share) $ 1.73 $ 1.61 $ 1.12
Diluted (in dollars per share) $ 1.71 $ 1.59 $ 1.11
Weighted average shares outstanding:      
Basic (in shares) 41,226 40,734 40,166
Diluted (in shares) 41,622 41,176 40,502
Other comprehensive income (loss):      
Foreign currency translation adjustment, net of tax $ (14,362) $ (1,281) $ (689)
Unrealized gain (loss) on investments, net of tax (522) 119 (96)
Total other comprehensive loss, net of tax (14,884) (1,162) (785)
Comprehensive income $ 56,363 $ 64,513 $ 44,139