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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | The following tabulation shows certain quarterly financial data for 2014 and 2013 (in thousands, except per share amounts):
| Quarter
2014 | 1 |  | 2 |  | 3 |  | 4
Net service revenues | $ | 1,084,342 |  |  | $ | 1,164,914 |  |  | $ | 1,224,308 |  |  | $ | 1,221,450 |
Gross margin | $ | 438,495 |  |  | $ | 478,444 |  |  | $ | 505,220 |  |  | $ | 500,757 |
Income before income taxes | $ | 102,014 |  |  | $ | 123,653 |  |  | $ | 138,361 |  |  | $ | 133,321 |
Net income | $ | 61,551 |  |  | $ | 75,140 |  |  | $ | 85,184 |  |  | $ | 84,053 |
Net income available to common stockholders - diluted | $ | 61,551 |  |  | $ | 75,140 |  |  | $ | 85,184 |  |  | $ | 84,053 |
Basic net income per share | $ | .45 |  |  | $ | .56 |  |  | $ | .64 |  |  | $ | .63 |
Diluted net income per share | $ | .45 |  |  | $ | .55 |  |  | $ | .63 |  |  | $ | .62 |
| 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 |

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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=35737889&loc=d3e1280-108306 + Details
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