Stock Option And Grant Plan (Information Regarding Stock Options Outstanding) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
$ 3.77 - $24.01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 3.77
Range of Exercise Prices, Upper Limit	$ 24.01
Options Outstanding, Options	1,530
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price	$ 19.71
Options Exercisable, Options	1,264
Options Exercisable, Weighted Average Exercise Price	$ 19.75
$ 25.32 - $40.87 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 25.32
Range of Exercise Prices, Upper Limit	$ 40.87
Options Outstanding, Options	1,425
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 1 month 28 days
Options Outstanding, Weighted Average Exercise Price	$ 33.36
Options Exercisable, Options	1,406
Options Exercisable, Weighted Average Exercise Price	$ 33.34
$ 40.89 - $48.97 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 40.89
Range of Exercise Prices, Upper Limit	$ 48.97
Options Outstanding, Options	1,962
Options Outstanding, Weighted Average Remaining Contractual Life (years)	7 years 3 months
Options Outstanding, Weighted Average Exercise Price	$ 45.13
Options Exercisable, Options	1,153
Options Exercisable, Weighted Average Exercise Price	$ 44.38
$ 51.52 - $67.34 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 51.52
Range of Exercise Prices, Upper Limit	$ 67.34
Options Outstanding, Options	1,139
Options Outstanding, Weighted Average Remaining Contractual Life (years)	8 years 8 months 1 day
Options Outstanding, Weighted Average Exercise Price	$ 58.69
Options Exercisable, Options	271
Options Exercisable, Weighted Average Exercise Price	$ 58.43
$ 67.44 - $69.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 67.44
Range of Exercise Prices, Upper Limit	$ 69.70
Options Outstanding, Options	1,066
Options Outstanding, Weighted Average Remaining Contractual Life (years)	9 years 9 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 67.66
Options Exercisable, Options	0
Options Exercisable, Weighted Average Exercise Price	$ 0.00