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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Selected Quarterly Financial Data | The following table sets forth the selected quarterly financial data for each of the quarters in 2012 (in thousands, except per share amounts):
|  | Quarter Ended |
|  | March 31, 2012 |  |  | June 30, 2012 |  |  | September 30, 2012 |  |  | December 31, 2012 |
Year Ended December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 739,885 |  |  | $ | 778,312 |  |  | $ | 804,888 |  |  | $ | 801,023 |
Gross margin |  |  | 83,742 |  |  |  | 87,358 |  |  |  | 91,587 |  |  |  | 93,379 |
Operating income |  |  | 22,511 |  |  |  | 27,850 |  |  |  | 30,351 |  |  |  | 31,648 |
Net income |  |  | 13,662 |  |  |  | 16,952 |  |  |  | 18,495 |  |  |  | 18,844 |
Basic earnings per share |  | $ | 0.37 |  |  | $ | 0.46 |  |  | $ | 0.50 |  |  | $ | 0.51 |
Diluted earnings per share |  | $ | 0.37 |  |  | $ | 0.46 |  |  | $ | 0.50 |  |  | $ | 0.51 |
The following table sets forth the selected quarterly financial data for each of the quarters in 2011 (in thousands, except per share amounts):
|  | Quarter Ended |
|  | March 31, 2011 |  |  | June 30, 2011 |  |  | September 30, 2011 |  |  | December 31, 2011 |
Year Ended December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 485,379 |  |  | $ | 751,201 |  |  | $ | 752,179 |  |  | $ | 762,775 |
Gross margin |  |  | 57,307 |  |  |  | 84,729 |  |  |  | 86,701 |  |  |  | 83,811 |
Operating income |  |  | 16,760 |  |  |  | 23,918 |  |  |  | 26,643 |  |  |  | 27,138 |
Net income |  |  | 10,498 |  |  |  | 14,390 |  |  |  | 16,276 |  |  |  | 17,014 |
Basic earnings per share |  | $ | 0.28 |  |  | $ | 0.39 |  |  | $ | 0.44 |  |  | $ | 0.46 |
Diluted earnings per share |  | $ | 0.28 |  |  | $ | 0.39 |  |  | $ | 0.44 |  |  | $ | 0.46 |

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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
Name: | us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration