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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Note N—Quarterly Financial Data (Unaudited) The following tabulation shows certain quarterly financial data for 2013 and 2012 (in thousands, except per share amounts):
|  | Quarter |
2013 |  | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Net service revenues |  | $ | 1,023,684 |  |  | $ | 1,063,228 |  |  | $ | 1,075,119 |  |  | $ | 1,083,864 |
Gross margin |  | $ | 410,290 |  |  | $ | 432,108 |  |  | $ | 437,478 |  |  | $ | 443,216 |
Income before income taxes |  | $ | 89,376 |  |  | $ | 100,596 |  |  | $ | 103,713 |  |  | $ | 103,894 |
Net income |  | $ | 55,863 |  |  | $ | 63,089 |  |  | $ | 66,358 |  |  | $ | 66,885 |
Net income available to common stockholders - diluted |  | $ | 55,861 |  |  | $ | 63,088 |  |  | $ | 66,358 |  |  | $ | 66,885 |
Basic net income per share |  | $ | .41 |  |  | $ | .46 |  |  | $ | .49 |  |  | $ | .49 |
Diluted net income per share |  | $ | .40 |  |  | $ | .46 |  |  | $ | .48 |  |  | $ | .49 |
|  | 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.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: 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=25249566&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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