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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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):
|  | 2015 |  | 2014 |  | 2013
Earnings: |  |  |  |  |  |
Net income (numerator for basic and diluted calculations) |  | $ | 502,166 |  |  | $ | 684,047 |  |  | $ | 418,837 |
Shares: |  |  |  |  |  |
Weighted average outstanding shares (denominator for basic calculations) |  | 66,553 |  |  | 69,248 |  |  | 71,917 |
Equivalent shares from outstanding stock options |  | 739 |  |  | 714 |  |  | 544 |
Diluted shares (denominator for diluted calculations) |  | 67,292 |  |  | 69,962 |  |  | 72,461 |
Earnings per share: |  |  |  |  |  |
Basic |  | $ | 7.55 |  |  | $ | 9.88 |  |  | $ | 5.82 |
Diluted |  | 7.46 |  |  | 9.78 |  |  | 5.78 |

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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://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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