Share-Based Compensation (Summarized Information Of Stock Options Outstanding) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	2,632
Options Outstanding, Average Remaining Contractual Life	6 years 4 months 2 days
Options Outstanding, Weighted Average Exercise price	$ 13.18	$ 10.97	$ 9.14	$ 7.55
Options Exercisable, Number Exercisable	1,040
Options Exercisable, Weighted Average Exercise Price	$ 9.84
$3.68 - 10.39 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	$ 3.68
Exercise Price Range, Upper Limit	$ 10.39
Options Outstanding, Number Outstanding	812
Options Outstanding, Average Remaining Contractual Life	3 years 7 months 16 days
Options Outstanding, Weighted Average Exercise price	$ 7.53
Options Exercisable, Number Exercisable	605
Options Exercisable, Weighted Average Exercise Price	$ 6.56
13.93 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range	$ 13.93
Options Outstanding, Number Outstanding	296
Options Outstanding, Average Remaining Contractual Life	5 years 0 months 3 days
Options Outstanding, Weighted Average Exercise price	$ 13.93
Options Exercisable, Number Exercisable	206
Options Exercisable, Weighted Average Exercise Price	$ 13.93
14.31 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range	$ 14.31
Options Outstanding, Number Outstanding	506
Options Outstanding, Average Remaining Contractual Life	7 years 0 months 3 days
Options Outstanding, Weighted Average Exercise price	$ 14.31
Options Exercisable, Number Exercisable	160
Options Exercisable, Weighted Average Exercise Price	$ 14.31
16.11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range	$ 16.11
Options Outstanding, Number Outstanding	444
Options Outstanding, Average Remaining Contractual Life	8 years 0 months 3 days
Options Outstanding, Weighted Average Exercise price	$ 16.11
Options Exercisable, Number Exercisable	69
Options Exercisable, Weighted Average Exercise Price	$ 16.11
17.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range	$ 17.50
Options Outstanding, Number Outstanding	574
Options Outstanding, Average Remaining Contractual Life	8 years 11 months 26 days
Options Outstanding, Weighted Average Exercise price	$ 17.50
Options Exercisable, Number Exercisable	0
Options Exercisable, Weighted Average Exercise Price	$ 17.50