Shareholders' Equity Transactions Stock Options Outstanding by Exercise Price (Details) (USD $)	6 Months Ended
	Jun. 30, 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, Options, Grants in Period, Net of Forfeitures	8,977
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	4,354,708
Weighted Average Remaining Contractual Life	5 years 2 months 13 days
Weighted Average Exercise Price	$ 24.02	$ 23.86
Number Exercisable At end of period	3,095,001
Weighted Average Exercise Price	$ 26.95
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	1,222,011
Weighted Average Remaining Contractual Life	8 years 4 months 13 days
Weighted Average Exercise Price	$ 13.95
Number Exercisable At end of period	307,617
Weighted Average Exercise Price	$ 13.97
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	1,548,349
Weighted Average Remaining Contractual Life	4 years 10 months 13 days
Weighted Average Exercise Price	$ 22.47
Number Exercisable At end of period	1,314,501
Weighted Average Exercise Price	$ 22.20
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	898,383
Weighted Average Remaining Contractual Life	5 years 0 months 13 days
Weighted Average Exercise Price	$ 25.72
Number Exercisable At end of period	786,918
Weighted Average Exercise Price	$ 25.77
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	685,965
Weighted Average Remaining Contractual Life	0 years 8 months 13 days
Weighted Average Exercise Price	$ 43.23
Number Exercisable At end of period	685,965
Weighted Average Exercise Price	$ 43.23