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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Information | The following tables set forth selected unaudited quarterly financial information for the years ended December 31, 2020 and 2019:
|  | Year Ended December 31, 2020 Quarter Ended
|  | March 31, 2020 |  | June 30, 2020 |  | September 30, 2020 |  | December 31, 2020
|  | (In thousands, except per share amounts)
Revenues |  | $ | 542,208 |  |  | $ | 504,520 |  |  | $ | 519,878 |  |  | $ | 556,910 |
Operating income (1) |  | $ | 98,267 |  |  | $ | 82,434 |  |  | $ | 88,770 |  |  | $ | 89,081 |
Equity in income of investees |  | $ | 6,063 |  |  | $ | 4,913 |  |  | $ | 8,271 |  |  | $ | 7,905 |
Net Income Attributable to BWX Technologies, Inc. |  | $ | 75,499 |  |  | $ | 64,258 |  |  | $ | 73,171 |  |  | $ | 65,742 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |
Net Income Attributable to BWX Technologies, Inc. |  | $ | 0.79 |  |  | $ | 0.67 |  |  | $ | 0.77 |  |  | $ | 0.69 |
Diluted: |  |  |  |  |  |  |  |
Net Income Attributable to BWX Technologies, Inc. |  | $ | 0.79 |  |  | $ | 0.67 |  |  | $ | 0.76 |  |  | $ | 0.69 |
(1)Includes equity in income of investees.
|  | Year Ended December 31, 2019 Quarter Ended
|  | March 31, 2019 |  | June 30, 2019 |  | September 30, 2019 |  | December 31, 2019
|  | (In thousands, except per share amounts)
Revenues |  | $ | 416,454 |  |  | $ | 471,231 |  |  | $ | 506,000 |  |  | $ | 501,235 |
Operating income (1) |  | $ | 63,644 |  |  | $ | 80,535 |  |  | $ | 98,462 |  |  | $ | 82,880 |
Equity in income of investees |  | $ | 7,682 |  |  | $ | 6,862 |  |  | $ | 7,874 |  |  | $ | 6,506 |
Net Income Attributable to BWX Technologies, Inc. |  | $ | 48,978 |  |  | $ | 58,878 |  |  | $ | 74,810 |  |  | $ | 61,449 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |
Net Income Attributable to BWX Technologies, Inc. |  | $ | 0.51 |  |  | $ | 0.62 |  |  | $ | 0.78 |  |  | $ | 0.64 |
Diluted: |  |  |  |  |  |  |  |
Net Income Attributable to BWX Technologies, Inc. |  | $ | 0.51 |  |  | $ | 0.62 |  |  | $ | 0.78 |  |  | $ | 0.64 |
(1)Includes equity in income of investees.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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