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Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2011
Selected Quarterly Financial Data [Abstract] |
Restated Selected Quarterly Financial Data |
|  |  |  |  |  | Quarter Ended June 30, 2011 |  |  | Quarter Ended September 30, 2011 |  |  |  |
|  | Quarter Ended March 31, 2011 |  |  | As Previously Reported |  |  | As Restated |  |  | As Previously Reported |  |  | As Restated |  |  | Quarter Ended December 31, 2011 |
Year Ended December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 485,379 |  |  | $ | 759,709 |  |  | $ | 751,201 |  |  | $ | 760,379 |  |  | $ | 752,179 |  |  | $ | 762,775 |
Gross margin |  |  | 57,307 |  |  |  | 84,753 |  |  |  | 84,729 |  |  |  | 86,722 |  |  |  | 86,701 |  |  |  | 83,811 |
Operating income |  |  | 16,760 |  |  |  | 23,918 |  |  |  | 23,918 |  |  |  | 26,643 |  |  |  | 26,643 |  |  |  | 27,138 |
Net income |  |  | 10,498 |  |  |  | 14,390 |  |  |  | 14,390 |  |  |  | 16,276 |  |  |  | 16,276 |  |  |  | 17,014 |
Basic earnings per share |  | $ | 0.28 |  |  | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.46 |
Diluted earnings per share |  | $ | 0.28 |  |  | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.46 |
|  | Quarter Ended |
|  | March 31, 2010 |  |  | June 30, 2010 |  |  | September 30, 2010 |  |  | December 31, 2010 |
Year Ended December 31, 2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 417,294 |  |  | $ | 458,113 |  |  | $ | 478,417 |  |  | $ | 479,913 |
Gross margin |  |  | 48,818 |  |  |  | 50,576 |  |  |  | 57,397 |  |  |  | 56,642 |
Operating income |  |  | 14,242 |  |  |  | 15,715 |  |  |  | 20,707 |  |  |  | 19,218 |
Net income |  |  | 8,702 |  |  |  | 9,630 |  |  |  | 12,617 |  |  |  | 12,509 |
Basic earnings per share |  | $ | 0.23 |  |  | $ | 0.26 |  |  | $ | 0.34 |  |  | $ | 0.34 |
Diluted earnings per share |  | $ | 0.23 |  |  | $ | 0.26 |  |  | $ | 0.34 |  |  | $ | 0.34 |

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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 -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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