Stockholders' Equity (Summary Of The Option And Stock Appreciation Rights Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options/SARs, Outstanding, December 31, 2013	188,947	373,899
Weighted average remaining life	3 years 10 months 17 days
Weighted Average Exercise Price per Share, Outstanding, December 31, 2013	$ 48.38	$ 43.90
Number of options currently exercisable	169,199
Weighted average exercise price per vested share	$ 50.05
$0.00 - $20.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower limit	$ 0.00
Range of Exercise Price, Upper limit	$ 20.00
Number of Options/SARs, Outstanding, December 31, 2013	3,975
Weighted average remaining life	6 years 1 month 24 days
Weighted Average Exercise Price per Share, Outstanding, December 31, 2013	$ 6.04
Number of options currently exercisable	2,321
Weighted average exercise price per vested share	$ 5.41
$20.01 - $40.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower limit	$ 20.01
Range of Exercise Price, Upper limit	$ 40.00
Number of Options/SARs, Outstanding, December 31, 2013	92,356
Weighted average remaining life	5 years 3 months 26 days
Weighted Average Exercise Price per Share, Outstanding, December 31, 2013	$ 35.13
Number of options currently exercisable	77,390
Weighted average exercise price per vested share	$ 35.08
$40.01 - $60.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower limit	$ 40.01
Range of Exercise Price, Upper limit	$ 60.00
Number of Options/SARs, Outstanding, December 31, 2013	59,308
Weighted average remaining life	2 years 8 months 19 days
Weighted Average Exercise Price per Share, Outstanding, December 31, 2013	$ 46.69
Number of options currently exercisable	56,180
Weighted average exercise price per vested share	$ 46.93
$60.01 - $90.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower limit	$ 60.01
Range of Exercise Price, Upper limit	$ 90.00
Number of Options/SARs, Outstanding, December 31, 2013	13,408
Weighted average remaining life	10 months 6 days
Weighted Average Exercise Price per Share, Outstanding, December 31, 2013	$ 74.04
Number of options currently exercisable	13,408
Weighted average exercise price per vested share	$ 74.04
$90.01 - $120.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower limit	$ 90.01
Range of Exercise Price, Upper limit	$ 120.00
Number of Options/SARs, Outstanding, December 31, 2013	19,900
Weighted average remaining life	2 years 2 months 16 days
Weighted Average Exercise Price per Share, Outstanding, December 31, 2013	$ 106.11
Number of options currently exercisable	19,900
Weighted average exercise price per vested share	$ 106.11