Stock Option and Incentive Plan Schedule of Stock Options Status (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Outstanding, Shares	155,623	324,938	963,895
Beginning Oustanding, Weighted Average Exercise Price	$ 89.35	$ 32.65	$ 34.44
Granted, Shares	186,007	146,844	0
Granted, Weighted Average Exercise Price	$ 107.23	$ 92.71	$ 0
Exercised, Shares	(22,823)	(316,159)	(638,957)
Exercised, Weighted Averge Exercise Price	$ 72.42	$ 32.63	$ 35.35
Canceled, Shares	(24,280)	0	0
Canceled, Weighted Average Exercise Price	$ 100.15	$ 0	$ 0
Ending Outstanding, Shares	294,527	155,623	324,938
Ending Oustanding, Weighted Average Exercise Pric	$ 101.06	$ 89.35	$ 32.65