Incentive Plan (Summary Of Stock Options) (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Incentive Plan [Abstract]
Outstanding, beginning of period, Number of Options Granted | shares	175,000
Options expired, Number of Options Granted | shares	(152,000)
Outstanding, end of period, Number of Options Granted | shares	23,000
Exercisable, end of period, Number of Options Granted | shares	23,000
Vested or expected to vest, end of period, Number of Options Granted | shares	23,000
Outstanding, beginning of period, Weighted Average Exercise Price | $ / shares	$ 26.29
Options expired, Weighted Average Exercise Price | $ / shares	26.84
Outstanding, end of period, Weighted Average Exercise Price | $ / shares	22.66
Exercisable, end of period, Weighted Average Exercise Price | $ / shares	22.66
Vested or expected to vest, end of period, Weighted Average Exercise Price | $ / shares	$ 22.66
Outstanding, end of period, Weighted Average Remaining Contractual Term (Years)	11 months 12 days
Exercisable, end of period, Weighted Average Remaining Contractual Term (Years)	11 months 12 days
Vested or expected to vest, end of period, Weighted Average Remaining Contractual Term (Years)	11 months 12 days