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Earnings per Share (Tables) | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Schedule Of Net Income Attributable To Common Stockholders | Diluted earnings per share include the effect of certain stock options.
|  | Three Months Ended March 31,
|  | 2017 |  | 2016
Net income attributable to Westlake Chemical Corporation |  | $ | 138,190 |  |  | $ | 123,128 |
Less: |  |  |  |
Net income attributable to participating securities |  | (694 | ) |  | (549 | )
Net income attributable to common shareholders |  | $ | 137,496 |  |  | $ | 122,579 |
Reconciliation Of Denominator For Basic And Diluted Earnings Per Share | The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
|  | Three Months Ended March 31,
|  | 2017 |  | 2016
Weighted average common shares—basic |  | 128,979,357 |  |  | 130,189,964 |
Plus incremental shares from: |  |  |  |
Assumed exercise of options |  | 712,658 |  |  | 410,550 |
Weighted average common shares—diluted |  | 129,692,015 |  |  | 130,600,514 |
Earnings per common share attributable to Westlake Chemical Corporation: |  |  |  |
Basic |  | $ | 1.07 |  |  | $ | 0.94 |
Diluted |  | $ | 1.06 |  |  | $ | 0.94 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Schedule of net income (loss) attributable to common stockholders [Table Text Block] + References No definition available. + Details
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