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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2017 | Sep. 23, 2016 | Oct. 01, 2017 | Sep. 23, 2016
Revenue from services | $ 660,780 | $ 697,097 | $ 1,839,146 | $ 2,015,689
Cost of services | 488,761 | 518,702 | 1,372,418 | 1,516,858
Gross profit | 172,019 | 178,395 | 466,728 | 498,831
Selling, general and administrative expense | 131,552 | 134,679 | 378,150 | 401,090
Depreciation and amortization | 11,189 | 11,690 | 34,650 | 34,673
Goodwill and intangible asset impairment charge | 0 | 4,275 | 0 | 103,544
Income (loss) from operations | 29,278 | 27,751 | 53,928 | (40,476)
Interest expense | (1,365) | (1,721) | (3,893) | (5,430)
Interest and other income | 1,146 | 854 | 3,903 | 2,657
Interest and other income (expense), net | (219) | (867) | 10 | (2,773)
Income (loss) before tax expense | 29,059 | 26,884 | 53,938 | (43,249)
Income tax expense (benefit) | 7,838 | 3,455 | 14,909 | (9,911)
Net income (loss) | $ 21,221 | $ 23,429 | $ 39,029 | $ (33,338)
Net income (loss) per common share: |  |  |  |
Basic (in dollars per share) | $ 0.52 | $ 0.56 | $ 0.94 | $ (0.80)
Diluted (in dollars per share) | $ 0.51 | $ 0.56 | $ 0.94 | $ (0.80)
Weighted average shares outstanding: |  |  |  |
Basic (in shares) | 41,046 | 41,762 | 41,420 | 41,651
Diluted (in shares) | 41,276 | 42,056 | 41,671 | 41,651
Other comprehensive income: |  |  |  |
Total other comprehensive income, net of tax | $ 1,567 | $ 2,031 | $ 4,553 | $ 4,287
Comprehensive income (loss) | 22,788 | 25,460 | 43,582 | (29,051)
Foreign currency translation adjustment |  |  |  |
Other comprehensive income: |  |  |  |
Foreign currency translation adjustment | 1,143 | 1,247 | 3,483 | 3,341
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
Other comprehensive income: |  |  |  |
Unrealized gain on investments, net of tax | $ 424 | $ 784 | $ 1,070 | $ 946

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