Incentive Plan (Summary Of Stock Options) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Incentive Plan [Abstract]
Outstanding, beginning of period, Number of Options Granted	280,000
Options exercised, Number of Options Granted	(103,750)
Outstanding, end of period, Number of Options Granted	176,250
Exercisable, end of period, Number of Options Granted	176,250
Vested or expected to vest, end of period, Number of Options Granted	176,250
Outstanding, beginning of period, Weighted Average Exercise Price	$ 19.05
Options exercised, Weighted Average Exercise Price	$ 6.98
Outstanding, end of period, Weighted Average Exercise Price	$ 26.15
Exercisable, end of period, Weighted Average Exercise Price	$ 26.15
Vested or expected to vest, end of period, Weighted Average Exercise Price	$ 26.15
Outstanding, end of period, Weighted Average Remaining Contractual Term (Years)	1 year 29 days
Exercisable, end of period, Weighted Average Remaining Contractual Term (Years)	1 year 29 days
Vested or expected to vest, end of period, Weighted Average Remaining Contractual Term (Years)	1 year 29 days