Stock-Based Compensation (Summary Of Stock Option And Restricted Stock Awards Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Outstanding
Outstanding at beginning	240,308
Granted	83,513	45,000	40,500
Exercised	(55,642)	(31,760)	(24,541)
Cancelled	(38,744)
Outstanding at ending	229,435	240,308
Weighted Average Exercise Price
Outstanding at beginning, Weighted Average Exercise Price	$ 22.21
Granted, Weighted Average Exercise Price	33.27
Exercised, Weighted Average Exercise Price	21.69
Cancelled, Weighted Average Exercise Price	22.37
Outstanding at ending, Weighted Average Exercise Price	$ 26.33	$ 22.21
Vested and Expected to Vest
Vested and expected to vest, Outstanding	226,219
Vested and expected to vest, Weighted Average Exercise Price	$ 26.45
Vested and expected to vest, Aggregate Intrinsic Value	$ 1,807
Exercisable, Outstanding	68,104
Exercisable, Weighted Average Exercise Price	$ 21.30
Exercisable, Aggregate Intrinsic Value	$ 895
Aggregate Intrinsic Value
Outstanding, Options, Aggregate Intrinsic Value	$ 1,860
Restricted Stock Awards [Member]
Number of Outstanding
Outstanding at beginning
Granted	2,860
Exercised	(2,860)
Cancelled
Outstanding at ending
Weighted Average Exercise Price
Outstanding at beginning, Weighted Average Exercise Price
Granted, Weighted Average Exercise Price	$ 34.81
Exercised, Weighted Average Exercise Price	$ 34.81
Cancelled, Weighted Average Exercise Price
Outstanding at ending, Weighted Average Exercise Price