Equity Incentive Plans (Summary Of Outstanding Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Exercise price range, lower limit	$ 45.20	$ 44.62	$ 44.98
Exercise price range, upper limit	$ 65.50	$ 65.50	$ 65.50
Options outstanding	840,665	881,338	1,002,833	1,071,096
Weighted avg. life remaining	5 years 2 months
Weighted avg. exercise price	$ 40.85	$ 38.51	$ 34.41	$ 32.00
Aggregate intrinsic value	$ 8,537
$18.18 - 19.99 [Member]
Exercise price range, lower limit	$ 18.18
Exercise price range, upper limit	$ 19.99
Options outstanding	201,859
Weighted avg. life remaining	5 years 1 month
20.00 - 29.99 [Member]
Exercise price range, lower limit	$ 20.00
Exercise price range, upper limit	$ 29.99
Options outstanding	0
Weighted avg. life remaining	0 years
30.00 - 39.99 [Member]
Exercise price range, lower limit	$ 30.00
Exercise price range, upper limit	$ 39.99
Options outstanding	25,731
Weighted avg. life remaining	4 years 4 months
40.00 - 49.99 [Member]
Exercise price range, lower limit	$ 40.00
Exercise price range, upper limit	$ 49.99
Options outstanding	502,222
Weighted avg. life remaining	5 years 8 months
50.00 - 59.99 [Member]
Exercise price range, lower limit	$ 50.00
Exercise price range, upper limit	$ 59.99
Options outstanding	17,500
Weighted avg. life remaining	6 years 6 months
60.00 - 65.50 [Member]
Exercise price range, lower limit	$ 60.00
Exercise price range, upper limit	$ 65.50
Options outstanding	93,353
Weighted avg. life remaining	3 years 0 months