Share Based Compensation (Schedule Of Stock Options Exercise Price) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Options Outstanding	8,341
Exercise Price, Options Exercisable	4,394
0.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 0.15
Exercise Price, Options Outstanding	52
Exercise Price, Options Exercisable	52
1.20 - 1.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 1.20
Exercise Price, Maximum	$ 1.56
Exercise Price, Options Outstanding	176
Exercise Price, Options Exercisable	176
2.00 - 2.31 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 2.00
Exercise Price, Maximum	$ 2.31
Exercise Price, Options Outstanding	810
Exercise Price, Options Exercisable	810
5.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 5.20
Exercise Price, Options Outstanding	705
Exercise Price, Options Exercisable	705
6.55 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 6.55
Exercise Price, Options Outstanding	13
Exercise Price, Options Exercisable	13
10.00 - 10.07 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 10.00
Exercise Price, Maximum	$ 10.07
Exercise Price, Options Outstanding	1,224
Exercise Price, Weighted Average Remaining Vesting Life in Years	0.69
Exercise Price, Options Exercisable	792
12.00 - 14.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 12.00
Exercise Price, Maximum	$ 14.00
Exercise Price, Options Outstanding	1,504
Exercise Price, Weighted Average Remaining Vesting Life in Years	0.22
Exercise Price, Options Exercisable	1,225
18.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 18.00
Exercise Price, Options Outstanding	108
Exercise Price, Weighted Average Remaining Vesting Life in Years	1.96
Exercise Price, Options Exercisable	52
20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 20.00
Exercise Price, Options Outstanding	414
Exercise Price, Weighted Average Remaining Vesting Life in Years	3.31
Exercise Price, Options Exercisable	81
23.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 23.00
Exercise Price, Options Outstanding	2,809
Exercise Price, Weighted Average Remaining Vesting Life in Years	3.31
Exercise Price, Options Exercisable	419
27.37-27.83 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 27.37
Exercise Price, Maximum	$ 27.83
Exercise Price, Options Outstanding	136
Exercise Price, Weighted Average Remaining Vesting Life in Years	3.82
29.00-29.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 29.00
Exercise Price, Maximum	$ 29.90
Exercise Price, Options Outstanding	227
Exercise Price, Weighted Average Remaining Vesting Life in Years	3.13
Exercise Price, Options Exercisable	53
33.49-34.72 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 33.49
Exercise Price, Maximum	$ 34.72
Exercise Price, Options Outstanding	163
Exercise Price, Weighted Average Remaining Vesting Life in Years	3.65
Exercise Price, Options Exercisable	16