Incentive Plan (Summary Of Stock Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Incentive Plan [Abstract]
Outstanding, beginning of period, Number of Options Granted	642,250
Options exercised, Number of Options Granted	(57,175)
Outstanding, end of period, Number of Options Granted	585,075
Exercisable, end of period, Number of Options Granted	585,075
Vested or expected to vest, end of period, Number of Options Granted	585,075
Outstanding, beginning of period, Weighted Average Exercise Price	$ 16.09
Options exercised, Weighted Average Exercise Price	$ 5.28
Outstanding, end of period, Weighted Average Exercise Price	$ 17.15
Exercisable, end of period, Weighted Average Exercise Price	$ 17.15
Vested or expected to vest, end of period, Weighted Average Exercise Price	$ 17.15
Outstanding, end of period, Weighted Average Remaining Contractual Term (Years)	2 years 2 months 23 days
Exercisable, end of period, Weighted Average Remaining Contractual Term (Years)	2 years 2 months 23 days
Vested or expected to vest, end of period, Weighted Average Remaining Contractual Term (Years)	2 years 2 months 23 days
Outstanding, end of period, Aggregate Intrinsic Value	$ 1,453
Exercisable, end of period, Aggregate Intrinsic Value	1,453
Vested or expected to vest, end of period, Aggregate Intrinsic Value	$ 1,453