Incentive Plan (Summary Of Stock Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Incentive Plan [Abstract]
Outstanding, beginning of period, Number of Options Granted	530,000
Options granted, Number of Options Granted	0	0	0
Options exercised, Number of Options Granted	(250,000)
Outstanding, end of period, Number of Options Granted	280,000	530,000
Exercisable, end of period, Number of Options Granted	280,000
Vested or expected to vest, end of period, Number of Options Granted	280,000
Outstanding, beginning of period, Weighted Average Exercise Price	$ 18.15
Options exercised, Weighted Average Exercise Price	$ 17.14
Outstanding, end of period, Weighted Average Exercise Price	$ 19.05	$ 18.15
Exercisable, end of period, Weighted Average Exercise Price	$ 19.05
Vested or expected to vest, end of period, Weighted Average Exercise Price	$ 19.05
Outstanding, end of period, Weighted Average Remaining Contractual Term (Years)	10 months 21 days
Exercisable, end of period, Weighted Average Remaining Contractual Term (Years)	10 months 21 days
Vested or expected to vest, end of period, Weighted Average Remaining Contractual Term (Years)	10 months 21 days
Outstanding, end of period, Aggregate Intrinsic Value	$ 3
Exercisable, end of period, Aggregate Intrinsic Value	3
Vested or expected to vest, end of period, Aggregate Intrinsic Value	$ 3