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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):
|  | 2018 |  | 2017 |  | 2016
Earnings: |  |  |  |  |  |
Net income (numerator for basic and diluted calculations) |  | $ | 715,842 |  |  | $ | 1,822,181 |  |  | $ | 701,443 |
Shares: |  |  |  |  |  |
Weighted average outstanding shares (denominator for basic calculations) |  | 63,658 |  |  | 64,427 |  |  | 64,274 |
Equivalent shares from outstanding stock options |  | 1,436 |  |  | 1,326 |  |  | 715 |
Diluted shares (denominator for diluted calculations) |  | 65,094 |  |  | 65,753 |  |  | 64,989 |
Earnings per share: |  |  |  |  |  |
Basic |  | $ | 11.25 |  |  | $ | 28.28 |  |  | $ | 10.91 |
Diluted |  | 11.00 |  |  | 27.71 |  |  | 10.79 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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