Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Income of Basic earnings per common share	$ 52,439	$ 41,027
Income of Effect of dilutive stock options, restricted stock and stock appreciation rights (SARs)	0	0
Income of Diluted earnings per common share	$ 52,439	$ 41,027
Weighted Shares of Basic earnings per common share	47,829	47,584
Weighted Shares of Effect of dilutive stock options, restricted stock and stock appreciation rights (SARs)	297	321
Weighted Shares of Diluted earnings per common share	48,126	47,905
Per-Share Amount of Basic earnings per common share	$ 1.10	$ 0.86
Per-Share Amount of Effect of dilutive stock options, restricted stock and stock appreciation rights (SARs)	$ (0.01)	$ 0.00
Per-Share Amount of Diluted earnings per common share	$ 1.09	$ 0.86

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Incremental Per Share Effect Of Dilutive Income Changes Over Dilutive Share Changes

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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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.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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.

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