Shareholders' Equity (Summary Of Stock Options Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
$2.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	11,171
Options Outstanding, Weighted Average Contractual Life (Years)
Options Outstanding, Weighted Average Exercise Price	$ 2.50
Options Exercisable	11,171
Options Exercisable, Weighted Average Exercise Price	$ 2.50
Minimum Exercise Price	$ 2.50
$4.00 - $7.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,192,317
Options Outstanding, Weighted Average Contractual Life (Years)	4.8
Options Outstanding, Weighted Average Exercise Price	$ 4.99
Options Exercisable	506,227
Options Exercisable, Weighted Average Exercise Price	$ 4.72
Minimum Exercise Price	$ 4.00
Maximum Exercise Price	$ 7.00
$10.00 - $16.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	813,274
Options Outstanding, Weighted Average Contractual Life (Years)	5.2
Options Outstanding, Weighted Average Exercise Price	$ 14.13
Options Exercisable	264,738
Options Exercisable, Weighted Average Exercise Price	$ 14.51
Minimum Exercise Price	$ 10.00
Maximum Exercise Price	$ 16.00
$16.00 - $17.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	809,790
Options Outstanding, Weighted Average Contractual Life (Years)	6.1
Options Outstanding, Weighted Average Exercise Price	$ 16.86
Options Exercisable
Options Exercisable, Weighted Average Exercise Price
Minimum Exercise Price	$ 16.00
Maximum Exercise Price	$ 17.00
$18.00 - $19.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	975,000
Options Outstanding, Weighted Average Contractual Life (Years)	5.9
Options Outstanding, Weighted Average Exercise Price	$ 18.15
Options Exercisable	325,000
Options Exercisable, Weighted Average Exercise Price	$ 18.15
Minimum Exercise Price	$ 18.00
Maximum Exercise Price	$ 19.00
$24.00 - $37.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,015,000
Options Outstanding, Weighted Average Contractual Life (Years)	0.9
Options Outstanding, Weighted Average Exercise Price	$ 31.89
Options Exercisable	1,015,000
Options Exercisable, Weighted Average Exercise Price	$ 31.89
Minimum Exercise Price	$ 24.00
Maximum Exercise Price	$ 37.00