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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Dec. 25, 2015
Revenue from services | $ 2,508,771 | $ 2,750,640 | $ 2,695,680
Cost of services | 1,874,298 | 2,070,922 | 2,060,007
Gross profit | 634,473 | 679,718 | 635,673
Selling, general and administrative expense | 510,794 | 546,477 | 495,988
Depreciation and amortization | 46,115 | 46,692 | 41,843
Goodwill and intangible asset impairment charge | 0 | 103,544 | 0
Income (loss) from operations | 77,564 | (16,995) | 97,842
Interest expense | (5,494) | (7,166) | (4,160)
Interest and other income | 5,480 | 3,821 | 2,765
Interest and other income (expense), net | (14) | (3,345) | (1,395)
Income (loss) before tax expense | 77,550 | (20,340) | 96,447
Income tax expense (benefit) | 22,094 | (5,089) | 25,200
Net income (loss) | $ 55,456 | $ (15,251) | $ 71,247
Net income (loss) per common share: |  |  |
Basic (in dollars per share) | $ 1.35 | $ (0.37) | $ 1.73
Diluted (in dollars per share) | $ 1.34 | $ (0.37) | $ 1.71
Weighted average shares outstanding: |  |  |
Basic (in shares) | 41,202 | 41,648 | 41,226
Diluted (in shares) | 41,441 | 41,648 | 41,622
Other comprehensive income (loss): |  |  |
Total other comprehensive income (loss), net of tax | $ 4,629 | $ 2,580 | $ (14,884)
Comprehensive income (loss) | 60,085 | (12,671) | 56,363
Foreign currency translation adjustment |  |  |
Other comprehensive income (loss): |  |  |
Foreign currency translation adjustment, net of tax | 3,355 | 1,830 | (14,362)
Unrealized gain (loss) on investments, net of tax |  |  |
Other comprehensive income (loss): |  |  |
Unrealized gain (loss) on investments, net of tax | $ 1,274 | $ 750 | $ (522)

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