Incentive Plan (Summary Of Incentive Award Plan's Stock Option) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning of period, Shares	80,933
Exercised, Shares	(8,001)
Options outstanding, end of period, Shares	72,932
Exercisable, end of period, Shares	72,932
Options outstanding, beginning of period, Weighted average exercise price ($ per share)	$ 37.25
Exercised, Weighted average exercise price ($ per share)	$ 41.73
Options outstanding, end of period, Weighted average exercise price ($ per share)	$ 36.76
Exercisable, end of period, Weighted average exercise price ($ per share)	$ 36.76