Shareholders' Equity Transactions Stock Options Outstanding by Exercise Price (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 13.35	$ 13.37	$ 10.70
Range of Exercise Price, Upper Limit	$ 47.80	$ 47.80	$ 47.80
Number Outstanding at Year End	4,533,782
Weighted Average Remaining Contractual Life	5 years 9 months 13 days
Weighted Average Exercise Price	$ 23.86	$ 26.21	$ 28.99	$ 29.60
Number Exercisable At Year End	2,985,175
Weighted Average Exercise Price	$ 27.65
Range of Exercise Price 10.70 to 15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 13.35
Range of Exercise Price, Upper Limit	$ 15.00
Number Outstanding at Year End	1,332,962
Weighted Average Remaining Contractual Life	8 years 10 months 13 days
Weighted Average Exercise Price	$ 13.96
Number Exercisable At Year End	152,186
Weighted Average Exercise Price	$ 13.40
Range of Exercise Price 15.01 to 25.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 15.01
Range of Exercise Price, Upper Limit	$ 25.00
Number Outstanding at Year End	1,580,572
Weighted Average Remaining Contractual Life	5 years 4 months 13 days
Weighted Average Exercise Price	$ 22.53
Number Exercisable At Year End	1,333,490
Weighted Average Exercise Price	$ 22.22
Range of Exercise Price 25.01 to 35.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 25.01
Range of Exercise Price, Upper Limit	$ 35.00
Number Outstanding at Year End	919,833
Weighted Average Remaining Contractual Life	5 years 7 months 13 days
Weighted Average Exercise Price	$ 25.73
Number Exercisable At Year End	799,084
Weighted Average Exercise Price	$ 25.76
Range of Exercise Price 35.01 to 47.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 35.01
Range of Exercise Price, Upper Limit	$ 47.80
Number Outstanding at Year End	700,415
Weighted Average Remaining Contractual Life	1 year 1 month 13 days
Weighted Average Exercise Price	$ 43.25
Number Exercisable At Year End	700,415
Weighted Average Exercise Price	$ 43.25