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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (Unaudited) | NOTE 16. Selected Quarterly Financial Data (Unaudited) The following table sets forth the selected quarterly financial data for each of the quarters in 2017 (in thousands, except per share amounts):
| Quarter Ended |
| March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
| 2017 |  |  | 2017 |  |  | 2017 |  |  | 2017 |
Year Ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 893,448 |  |  | $ | 924,513 |  |  | $ | 1,054,360 |  |  | $ | 1,162,576 |
Gross margin |  | 101,585 |  |  |  | 101,317 |  |  |  | 116,524 |  |  |  | 138,091 |
Operating income |  | 17,177 |  |  |  | 16,578 |  |  |  | 21,669 |  |  |  | 41,127 |
Net income |  | 10,334 |  |  |  | 9,542 |  |  |  | 15,334 |  |  |  | 99,943 |
Basic earnings per share | $ | 0.31 |  |  | $ | 0.29 |  |  | $ | 0.46 |  |  | $ | 3.01 |
Diluted earnings per share | $ | 0.31 |  |  | $ | 0.29 |  |  | $ | 0.46 |  |  | $ | 2.99 |
The following table sets forth the selected quarterly financial data for each of the quarters in 2016 (in thousands, except per share amounts):
| Quarter Ended |
| March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
| 2016 |  |  | 2016 |  |  | 2016 |  |  | 2016 |
Year Ended December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 805,859 |  |  | $ | 855,557 |  |  | $ | 932,814 |  |  | $ | 978,560 |
Gross margin |  | 108,387 |  |  |  | 114,490 |  |  |  | 111,454 |  |  |  | 120,454 |
Operating income |  | 28,843 |  |  |  | 34,297 |  |  |  | 29,855 |  |  |  | 30,839 |
Net income |  | 17,965 |  |  |  | 20,671 |  |  |  | 17,924 |  |  |  | 18,244 |
Basic earnings per share | $ | 0.51 |  |  | $ | 0.61 |  |  | $ | 0.54 |  |  | $ | 0.55 |
Diluted earnings per share | $ | 0.51 |  |  | $ | 0.61 |  |  | $ | 0.54 |  |  | $ | 0.55 |

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- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
Name: | us-gaap_QuarterlyFinancialInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration