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Per Share Information (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share | The amounts used to compute the basic and diluted earnings per share for the years ended December 31, 2014, 2013 and 2012 are illustrated below (in thousands):
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Amounts Attributable to Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  | $ | 297,341 |  |  | $ | 401,921 |  |  | $ | 289,694 |
Net income (loss) from discontinued operations |  |  | (627 | ) |  |  | — |  |  |  | 16,935 |
Net income attributable to common stock |  | $ | 296,714 |  |  | $ | 401,921 |  |  | $ | 306,629 |
Weighted Average Shares: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding for basic earnings per share |  |  | 219,668 |  |  |  | 214,929 |  |  |  | 212,777 |
Effect of dilutive stock options |  |  | 22 |  |  |  | 49 |  |  |  | 58 |
Weighted average shares outstanding for diluted earnings per share |  |  | 219,690 |  |  |  | 214,978 |  |  |  | 212,835 |

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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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