Stockholders' Equity (Summary Of Stock Options Outstanding) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Shares Outstanding	453,331	[1]
Option Shares Exercisable	289,971	[1]
Aggregate intrinsic value, option shares outstanding	$ 15.5
Aggregate intrinsic value, option shares exercisable	$ 10.1
Weighted average remaining term, option shares outstanding	2 years
Weighted average remaining term, option shares exercisable	1 year 9 months 18 days
$15.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 15.49
Options Shares Outstanding	93,881
Remaining Life in Years	10 months 24 days
Option Shares Exercisable	93,881
$15.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 15.67
Options Shares Outstanding	196,350
Remaining Life in Years	1 year 10 months 24 days
Option Shares Exercisable	141,350
$19.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 19.17
Options Shares Outstanding	163,100
Remaining Life in Years	2 years 10 months 24 days
Option Shares Exercisable	54,740

[1] The aggregate intrinsic value for option shares outstanding and option shares exercisable is $15.5 million and $10.1 million, respectively. The weighted average remaining term for option shares outstanding and option shares exercisable is 2.0 years and 1.8 years, respectively.