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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2012 | Sep. 30, 2011 | Sep. 28, 2012 | Sep. 30, 2011
Revenue from services | $ 379,467 | $ 371,379 | $ 1,044,915 | $ 965,857
Cost of services | 274,237 | 271,528 | 766,914 | 710,644
Gross profit | 105,230 | 99,851 | 278,001 | 255,213
Selling, general and administrative expenses | 77,634 | 73,235 | 221,243 | 206,071
Depreciation and amortization | 4,660 | 4,205 | 14,156 | 11,989
Income from operations | 22,936 | 22,411 | 42,602 | 37,153
Interest expense | (266) | (371) | (900) | (1,059)
Interest and other income | 675 | 694 | 1,986 | 1,857
Interest and other income, net | 409 | 323 | 1,086 | 798
Income before tax expense | 23,345 | 22,734 | 43,688 | 37,951
Income tax expense | 8,998 | 8,821 | 17,474 | 14,724
Net income | 14,347 | 13,913 | 26,214 | 23,227
Net income per common share: |  |  |  |
Basic (in dollars per share) | $ 0.36 | $ 0.33 | $ 0.66 | $ 0.54
Diluted (in dollars per share) | $ 0.36 | $ 0.33 | $ 0.66 | $ 0.54
Weighted average shares outstanding: |  |  |  |
Basic (in shares) | 39,516 | 41,612 | 39,547 | 42,813
Diluted (in shares) | 39,858 | 41,958 | 39,841 | 43,176
Comprehensive income | $ 14,851 | $ 13,154 | $ 26,586 | $ 22,763

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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