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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 23, 2016 | Sep. 25, 2015 | Sep. 23, 2016 | Sep. 25, 2015
Revenue from services | $ 697,097 | $ 683,918 | $ 2,015,689 |  | $ 1,884,947
Cost of services | 518,702 | 515,051 | 1,516,858 |  | 1,434,278
Gross profit | 178,395 | 168,867 | 498,831 |  | 450,669
Selling, general and administrative expenses | 134,679 | 125,117 | 401,090 |  | 354,569
Depreciation and amortization | 11,690 | 10,498 | 34,673 |  | 31,415
Goodwill and intangible asset impairment charge | 4,275 | 0 | 103,544 |  | 0
Income (loss) from operations | 27,751 | 33,252 | (40,476) |  | 64,685
Interest expense | (1,721) | (933) | (5,430) |  | (2,980)
Interest and other income | 854 | 567 | 2,657 |  | 1,878
Interest and other expense, net | (867) | (366) | (2,773) |  | (1,102)
Income (loss) before tax expense | 26,884 | 32,886 | (43,249) |  | 63,583
Income tax expense (benefit) | 3,455 | 12,796 | (9,911) |  | 20,504
Net income (loss) | $ 23,429 | $ 20,090 | $ (33,338) |  | $ 43,079
Net income (loss) per common share: |  |  |  |  |
Basic (in dollars per share) | $ 0.56 | $ 0.49 | $ (0.80) |  | $ 1.05
Diluted (in dollars per share) | $ 0.56 | $ 0.48 | $ (0.80) |  | $ 1.04
Weighted average shares outstanding: |  |  |  |  |
Basic (in shares) | 41,762 | 41,296 | 41,651 |  | 41,189
Diluted (in shares) | 42,056 | 41,620 | 41,651 |  | 41,546
Other comprehensive income (loss): |  |  |  |  |
Total other comprehensive income (loss), net of tax | $ 2,031 | $ (1,716) | $ 4,287 |  | $ (1,987)
Comprehensive income (loss) | 25,460 | 18,374 | (29,051) |  | 41,092
Foreign currency translation adjustment |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustment, net of tax | 1,247 | (881) | 3,341 |  | (1,706)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |
Unrealized gain on investments, net of tax | $ 784 | $ (835) | $ 946 | [1] | $ (281)
[1] | Consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities. The tax impact on unrealized gain on available-for-sale securities was de minimis for the thirty-nine weeks ended September 23, 2016.

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