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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Revenue from services | $ 588,594 | $ 614,301 | $ 1,140,946 | $ 1,168,689
Cost of services | 430,277 | 448,717 | 834,253 | 859,837
Gross profit | 158,317 | 165,584 | 306,693 | 308,852
Selling, general and administrative expense | 127,599 | 134,207 | 257,260 | 259,970
Depreciation and amortization | 9,827 | 10,101 | 19,779 | 20,191
Income from operations | 20,891 | 21,276 | 29,654 | 28,691
Interest expense | (660) | (1,355) | (1,382) | (2,245)
Interest and other income | 1,487 | 387 | 2,762 | 3,481
Interest and other income (expense), net | 827 | (968) | 1,380 | 1,236
Income before tax expense | 21,718 | 20,308 | 31,034 | 29,927
Income tax expense | 2,312 | 2,576 | 3,352 | 3,440
Net income | $ 19,406 | $ 17,732 | $ 27,682 | $ 26,487
Net income per common share: |  |  |  |
Basic (in dollars per share) | $ 0.50 | $ 0.44 | $ 0.71 | $ 0.66
Diluted (in dollars per share) | $ 0.49 | $ 0.44 | $ 0.70 | $ 0.65
Weighted average shares outstanding: |  |  |  |
Basic (in shares) | 39,163 | 40,227 | 39,264 | 40,335
Diluted (in shares) | 39,554 | 40,469 | 39,619 | 40,576
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Comprehensive income | $ 18,713 | $ 15,811 | $ 28,315 | $ 23,182
Accumulated other comprehensive loss |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Foreign currency translation adjustment | $ (693) | $ (1,921) | $ 633 | $ (3,305)

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