Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data | 3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Summary Of Significant Accounting Policies | ||||
| Basic earnings per common share, Income (Numerator) | $ 49,232 | $ 56,389 | $ 160,563 | $ 169,287 |
| Basic earnings per common share, Shares (Denominator) | 181,718 | 187,964 | 184,030 | 189,090 |
| Basic earnings per common share, Per Share Amount | $ 0.27 | $ 0.30 | $ 0.87 | $ 0.90 |
| Dilutive effect of stock options, Income (Numerator) | 0 | 0 | 0 | 0 |
| Dilutive effect of stock options, Shares (Denominator) | 862 | 1,557 | 2,002 | 1,604 |
| Diluted earnings per common share, Income (Numerator) | $ 49,232 | $ 56,389 | $ 160,563 | $ 169,287 |
| Diluted earnings per common share, Shares (Denominator) | 182,580 | 189,521 | 186,032 | 190,694 |
| Diluted earnings per common share, Per Share Amount | $ 0.27 | $ 0.30 | $ 0.86 | $ 0.89 |
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- Definition The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities. 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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- 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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- 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 Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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