Stock-Based And Long-Term Incentive Compensation (Summary Of Non-Vested Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number of Options
Beginning balance | shares	141,286
Granted | shares	59,286
Vested | shares	(98,158)
Ending balance | shares	102,414
Weighted Average Grant Date Fair Value
Beginning balance | $ / shares	$ 80.00
Granted | $ / shares	43.60
Vested | $ / shares	112.09
Ending balance | $ / shares	$ 78.47