Shareholders' Equity Transactions Stock Options Outstanding by Exercise Price (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years
Range of Exercise Price, Lower Limit	$ 12.42
Range of Exercise Price, Upper Limit	$ 47.80
Number Outstanding at end of period	4,419,069
Weighted Average Remaining Contractual Life	4 years 9 months 13 days
Weighted Average Exercise Price	$ 23.97	$ 23.86
Number Exercisable At end of period	3,441,676
Weighted Average Exercise Price	$ 26.13
Range of Exercise Price 12.42 to 15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Limit	$ 12.42
Range of Exercise Price, Upper Limit	$ 15.00
Number Outstanding at end of period	1,256,124
Weighted Average Remaining Contractual Life	7 years 10 months 13 days
Weighted Average Exercise Price	$ 13.95
Number Exercisable At end of period	461,239
Weighted Average Exercise Price	$ 13.78
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 end of period	1,563,747
Weighted Average Remaining Contractual Life	4 years 4 months 13 days
Weighted Average Exercise Price	$ 22.52
Number Exercisable At end of period	1,419,474
Weighted Average Exercise Price	$ 22.38
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 end of period	912,383
Weighted Average Remaining Contractual Life	4 years 6 months 13 days
Weighted Average Exercise Price	$ 25.73
Number Exercisable At end of period	893,223
Weighted Average Exercise Price	$ 25.71
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 end of period	686,815
Weighted Average Remaining Contractual Life	0 years 3 months 13 days
Weighted Average Exercise Price	$ 43.23
Number Exercisable At end of period	667,740
Weighted Average Exercise Price	$ 43.22