Stock Compensation Plans (SSAR's And Stock Options Activity) (Details) (SSAR's And Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2011
SSAR's And Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2010, Shares Subject to SSAR's/Options	1,440,000
Granted, Shares Subject to SSAR's/Options	78,000
Exercised, Shares Subject to SSAR's/Options	(428,000)
Balance at December 31, 2011, Shares Subject to SSAR's/Options	1,090,000
Balance at December 31, 2010, Weighted Average Exercise Price	$ 37.46
Granted, Weighted Average Exercise Price	$ 62.13
Exercised, Weighted Average Exercise Price	$ 37.46
Balance at December 31, 2011, Weighted Average Exercise Price	$ 39.16
Balance at December 31, 2010, SSAR's/Options Exercisable	883,000
Balance at December 31, 2011,SSAR's/Options Exercisable	627,000