Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Basic EPS: | ||||
| Net income applicable to common stock | $ 69,326 | $ 77,287 | $ 210,040 | $ 179,864 |
| Amount allocable to common shareholders | 99.10% | 99.20% | 99.10% | 99.20% |
| Rights to undistributed earnings | 68,686 | 76,695 | 208,106 | 178,482 |
| Weighted average shares outstanding- basic | 362,019,205 | 353,954,532 | 359,763,082 | 353,342,910 |
| Net income per common share - basic | $ 0.19 | $ 0.22 | $ 0.58 | $ 0.51 |
| Restricted common shares issued, not vested, excluded from basic net income per common share | 3,400,000 | 2,700,000 | 2,700,000 | |
| Diluted EPS: | ||||
| Rights to undistribued earnings | $ 68,686 | $ 76,695 | $ 208,106 | $ 178,482 |
| Weighted average shares outstanding- basic | 362,019,205 | 353,954,532 | 359,763,082 | 353,342,910 |
| Effect of dilutive securities, stock options | 2,846,021 | 2,468,684 | 3,954,716 | 2,250,869 |
| Weighted average shares outstanding - diluted | 364,865,226 | 356,423,216 | 363,717,798 | 355,593,779 |
| Net Income Per Common Share, Diluted | $ 0.19 | $ 0.22 | $ 0.57 | $ 0.50 |
Stock Options [Member] | ||||
| Diluted EPS: | ||||
| Antidilutive securities excluded from calculation of diluted net income per common share | 18,500,000 | 22,300,000 | 17,800,000 | 25,200,000 |
| X | ||||||||||
- Definition Percentage of undistributed earnings that is allocable to common shareholders.
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| X | ||||||||||
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Includes the adjustments resulting from the assumption that dilutive securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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