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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block] | The following table sets forth the computation of basic and diluted earnings per share on net income (loss) (in thousands, except per share information):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Earnings: |  |  |  |  |  |  |  |
Net income (loss) (numerator for basic and diluted calculations) |  | $ | (49,612 | ) |  | $ | 141,111 |  |  | $ | 135,923 |  |  | $ | 264,429 |
Shares: |  |  |  |  |  |  |  |
Weighted average outstanding shares (denominator for basic calculation) |  | 72,350 |  |  | 73,718 |  |  | 73,089 |  |  | 73,646 |
Equivalent shares from outstanding stock options |  | — |  |  | 336 |  |  | 484 |  |  | 402 |
Denominator for diluted calculation |  | 72,350 |  |  | 74,054 |  |  | 73,573 |  |  | 74,048 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | (0.69 | ) |  | $ | 1.91 |  |  | $ | 1.86 |  |  | $ | 3.59 |
Diluted |  | $ | (0.69 | ) |  | $ | 1.91 |  |  | $ | 1.85 |  |  | $ | 3.57 |

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