Stock-Based And Long-Term Incentive Compensation (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summarization of stock option activity
Number of options outstanding, beginning	669,360
Number of options granted	0
Number of options exercised	0	0	0
Number of options forfeited	(56,056)
Number of options expired	(145,057)
Number of options outstanding, ending	468,247	669,360
Number of options exercisable	468,247
Weighted average option price outstanding, beginning	$ 169.11
Weighted average option price granted	0
Weighted average option price excercised	0
Weighted average option price forfeited	63.18
Weighted average option price expired	249.23
Weighted average option price outstanding, ending	156.97	$ 169.11
Weighted average option price exercisable	$ 156.97
Weighted average remaining contractual term, outstanding	4 years 6 months	4 years 8 months 12 days
Weighted average remaining contractual term, exercisable	4 years 6 months

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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Number of share options (or share units) exercised during the current period.

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