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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2014 | Sep. 27, 2013 | Sep. 26, 2014 | Sep. 27, 2013
Revenue from services | $ 633,365 | $ 451,169 | $ 1,482,655 |  | $ 1,219,977
Cost of services | 473,766 | 327,641 | 1,103,914 |  | 897,937
Gross profit | 159,599 | 123,528 | 378,741 |  | 322,040
Selling, general and administrative expenses | 120,318 | 90,767 | 308,654 |  | 268,538
Depreciation and amortization | 9,719 | 4,771 | 20,126 |  | 15,133
Income from operations | 29,562 | 27,990 | 49,961 |  | 38,369
Interest expense | (1,140) | (350) | (1,725) |  | (919)
Interest and other income | 731 | 766 | 2,110 |  | 2,086
Interest and other income (expense), net | (409) | 416 | 385 |  | 1,167
Income before tax expense | 29,153 | 28,406 | 50,346 |  | 39,536
Income tax expense | 8,243 | 9,454 | 11,696 |  | 9,124
Net income | 20,910 | 18,952 | 38,650 |  | 30,412
Net income per common share: |  |  |  |  |
Basic (in dollars per share) | $ 0.51 | $ 0.47 | $ 0.95 |  | $ 0.76
Diluted (in dollars per share) | $ 0.51 | $ 0.47 | $ 0.94 |  | $ 0.75
Weighted average shares outstanding: |  |  |  |  |
Basic (in shares) | 40,793 | 40,330 | 40,701 |  | 40,085
Diluted (in shares) | 41,038 | 40,670 | 40,971 |  | 40,395
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation adjustment, net of tax | (1,087) | 109 | (997) |  | (439)
Unrealized gain (loss) on investments, net of tax | (81) | (30) | 372 |  | (37)
Total other comprehensive income (loss), net of tax | (1,168) | 79 | (625) | [1] | (476)
Comprehensive income | $ 19,742 | $ 19,031 | $ 38,025 |  | $ 29,936
[1] | The tax impact of the components of other comprehensive income was immaterial.

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