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Per Share Information (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share | The amounts used to compute the basic and diluted earnings per share for the three and six months ended June 30, 2013 and 2012 are illustrated below (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
AMOUNTS ATTRIBUTABLE TO COMMON STOCK: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  | $ | 70,237 |  |  | $ | 57,918 |  |  | $ | 142,318 |  |  | $ | 103,716 |
Net income from discontinued operations |  |  | — |  |  |  | 7,620 |  |  |  | — |  |  |  | 7,529 |
Net income attributable to common stock |  | $ | 70,237 |  |  | $ | 65,538 |  |  | $ | 142,318 |  |  | $ | 111,245 |
WEIGHTED AVERAGE SHARES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding for basic earnings per share |  |  | 214,314 |  |  |  | 212,987 |  |  |  | 213,833 |  |  |  | 212,244 |
Effect of dilutive stock options |  |  | 54 |  |  |  | 100 |  |  |  | 53 |  |  |  | 98 |
Weighted average shares outstanding for diluted earnings per share |  |  | 214,368 |  |  |  | 213,087 |  |  |  | 213,886 |  |  |  | 212,342 |

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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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