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Selected Quarterly Data Selected Quarterly Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Summary Of Selected Quarterly Data | The following table represents unaudited selected quarterly financial data for the two years ended December 31, 2012. Beginning with quarter ended December 31, 2011, the selected quarterly financial data includes the results of ECP, which was acquired effective October 1, 2011. The operating results for any quarter are not necessarily indicative of the results for any future period.
| Quarter Ended
(In thousands, except per share data) | Mar. 31 |  | Jun. 30 |  | Sep. 30 |  | Dec. 31
2011 |  |  |  |  |  |  |
Revenue | $ | 786,648 |  |  | $ | 759,684 |  |  | $ | 783,898 |  |  | $ | 939,632 |
Gross margin(1) | 343,646 |  |  | 322,236 |  |  | 334,322 |  |  | 391,789 |
Operating income(1) | 107,371 |  |  | 78,486 |  |  | 85,488 |  |  | 90,138 |
Net income(2) | 58,182 |  |  | 46,706 |  |  | 49,231 |  |  | 56,145 |
Basic earnings per share(3) | $ | 0.20 |  |  | $ | 0.16 |  |  | $ | 0.17 |  |  | $ | 0.19 |
Diluted earnings per share(3) | $ | 0.20 |  |  | $ | 0.16 |  |  | $ | 0.17 |  |  | $ | 0.19 |
| Quarter Ended
(In thousands, except per share data) | Mar. 31 |  | Jun. 30 |  | Sep. 30 |  | Dec. 31
2012 |  |  |  |  |  |  |
Revenue | $ | 1,031,777 |  |  | $ | 1,006,531 |  |  | $ | 1,016,707 |  |  | $ | 1,067,915 |
Gross margin(1) | 447,383 |  |  | 421,931 |  |  | 409,705 |  |  | 445,121 |
Operating income(1) | 133,608 |  |  | 108,567 |  |  | 91,434 |  |  | 104,344 |
Net income(2) | 80,991 |  |  | 63,998 |  |  | 54,048 |  |  | 62,188 |
Basic earnings per share(3) | $ | 0.28 |  |  | $ | 0.22 |  |  | $ | 0.18 |  |  | $ | 0.21 |
Diluted earnings per share(3) | $ | 0.27 |  |  | $ | 0.21 |  |  | $ | 0.18 |  |  | $ | 0.21 |
(1) | Gross margin and operating income during the quarters ended March 31, 2012, June 30, 2012, September 30, 2012 and December 31, 2012 include gains of $8.3 million, $8.4 million, $0.5 million and $0.7 million, respectively, resulting from lawsuit settlements with certain of our aftermarket product suppliers as discussed in Note 8, "Commitments and Contingencies."
(2) | Net income during the quarters ended June 30, 2011 and December 31, 2011 includes a gain of $1.6 million and a loss of $0.2 million, respectively, for changes in fair value of our contingent consideration liabilities. The quarters ended March 31, 2012 and December 31, 2012 include gains for changes in fair value of our contingent consideration liabilities of $1.3 million and $0.2 million, respectively, while the quarters ended June 30, 2012 and September 30, 2012 include losses of $1.2 million and $1.9 million, respectively. See Note 7, "Fair Value Measurements," for further information on these changes in fair value of the contingent consideration obligations recorded in earnings during the periods.
(3) | The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in weighted average shares outstanding throughout the year.

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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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