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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Data | The following tabulation shows certain quarterly financial data for 2012 and 2011 (in thousands, except per share amounts):
|  | Quarter |
2012 |  | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Net service revenues |  | $ | 1,015,444 |  |  | $ | 1,028,383 |  |  | $ | 1,033,173 |  |  | $ | 1,034,213 |
Gross margin |  | $ | 402,083 |  |  | $ | 415,303 |  |  | $ | 415,249 |  |  | $ | 416,425 |
Income before income taxes |  | $ | 80,264 |  |  | $ | 72,272 | (a) |  | $ | 94,467 |  |  | $ | 97,242 |
Net income |  | $ | 48,334 |  |  | $ | 45,329 | (a) |  | $ | 57,660 |  |  | $ | 58,619 |
Net income available to common stockholders - diluted |  | $ | 48,070 |  |  | $ | 45,101 |  |  | $ | 57,383 |  |  | $ | 58,322 |
Basic net income per share |  | $ | .34 |  |  | $ | .33 |  |  | $ | .42 |  |  | $ | .43 |
Diluted net income per share |  | $ | .34 |  |  | $ | .32 | (a) |  | $ | .41 |  |  | $ | .42 |
(a) | The decrease in second quarter 2012 income before income taxes, net income, and net income per share was primarily due to a charge related to a litigation settlement disclosed in the Company’s July 5, 2012, Form 8-K. The settlement resulted in a non-recurring $19.0 million pre-tax charge to selling, general and administrative expenses and reduced second quarter net income and net income per share by $11.4 million and $0.08 per share, respectively.
|  | Quarter |
2011 |  | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Net service revenues |  | $ | 880,869 |  |  | $ | 937,966 |  |  | $ | 984,668 |  |  | $ | 973,473 |
Gross margin |  | $ | 338,089 |  |  | $ | 372,288 |  |  | $ | 391,903 |  |  | $ | 387,322 |
Income before income taxes |  | $ | 44,576 |  |  | $ | 61,284 |  |  | $ | 72,195 |  |  | $ | 72,161 |
Net income |  | $ | 26,705 |  |  | $ | 36,425 |  |  | $ | 44,168 |  |  | $ | 42,624 |
Net income available to common stockholders - diluted |  | $ | 26,293 |  |  | $ | 35,890 |  |  | $ | 43,556 |  |  | $ | 42,037 |
Basic net income per share |  | $ | .18 |  |  | $ | .25 |  |  | $ | .31 |  |  | $ | .30 |
Diluted net income per share |  | $ | .18 |  |  | $ | .25 |  |  | $ | .31 |  |  | $ | .30 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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