Earnings Per Share (Schedule Of Computation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Earnings, Income	$ 110,274	$ 99,317	$ 77,227
Dilutive stock options, Income
Nonvested stock awards, Income
Conversion of Notes, Income
Diluted earnings, Income	$ 110,274	$ 99,317	$ 77,227
Net Income, Earnings, Shares	16,870	17,165	18,199
Dilutive stock options, Shares	394	412	278
Nonvested stock awards, Shares	158	149	108
Conversion of Notes and impact of warrants outstanding, Shares		114
Net Income, Diluted Earnings, Shares	17,422	17,840	18,585
Earnings per Share	$ 6.54	$ 5.79	$ 4.24
Earnings per Share, Diluted	$ 6.33	$ 5.57	$ 4.16

Amount of dilutive securities, nonvested stock awards

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Amount of dilutive securities stock options

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- Definition

Incremental Common Shares Attributable To Conversion Of Debt Securities And Warrants

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No definition available.

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The amount of nonvested stock awards used in the calculation of average diluted shares outstanding.

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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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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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.

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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 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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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.

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