Stock-Based And Long-Term Incentive Compensation (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Summarization of stock option activity
Number of options outstanding, beginning	643,545
Number of options granted	59,286
Number of options expired	(33,471)
Number of options outstanding, ending	669,360	643,545
Number of options exercisable	566,946
Number of options expected to vest	102,414
Weighted average option price outstanding, beginning	$ 182.69
Weighted average option price granted	43.6
Weighted average option price expired	207.88
Weighted average option price outstanding, ending	169.11	$ 182.69
Weighted average option price exercisable	185.48
Weighted average option price expected to vest	$ 78.47
Weighted average remaining contractual term, outstanding	4 years 8 months 12 days	5 years
Weighted average remaining contractual term, exercisable	4 years
Weighted average remaining contractual term, expected to vest	8 years 7 months 6 days

Summarization of stock option activity.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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