Earnings Per Share (Schedule Of Computation Of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Earnings, Income	$ 24,537us-gaap_NetIncomeLoss	$ 20,574us-gaap_NetIncomeLoss
Diluted earnings, Income	$ 24,537	$ 20,574
Earnings per Share	$ 1.45us-gaap_EarningsPerShareBasic	$ 1.17us-gaap_EarningsPerShareBasic
Earnings per Share, Diluted	$ 1.40us-gaap_EarningsPerShareDiluted	$ 1.12us-gaap_EarningsPerShareDiluted
Net Income, Earnings, Shares	16,914	17,510
Dilutive stock options, Shares	397	362
Nonvested stock awards, Shares	155che_NonvestedStockAwards	148che_NonvestedStockAwards
Conversion of Notes, Shares		285
Net Income, Diluted Earnings, Shares	17,466	18,305

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

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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 convertible debt securities using the if-converted method.

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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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