Employee Benefit Plans (Activity For Option Plans) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Employee Benefit Plans [Abstract]
Shares Under Options outstanding, beginning balance	5,795
Shares Under Option, Granted	448
Shares Under Option, Exercised	(3,079)
Shares Under Option, Forfeited	(20)
Shares Under Options outstanding, ending balance	3,144
Shares Under Options, Options exercisable, ending balance	1,552
Weighted-Average Exercise Price of Options outstanding, beginning balance	$ 46.86
Weighted-Average Exercise Price, Granted	$ 71.79
Weighted-Average Exercise Price, Exercised	$ 43.63
Weighted-Average Exercise Price, Forfeited	$ 43.66
Weighted-Average Exercise Price of Options outstanding, ending balance	$ 53.60
Weighted-Average Exercise Price, Options exercisable, ending balance	$ 55.68