Shareholders' Equity Transactions (Stock Options Outstanding by Exercise Price) (Details) (USD $)			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 $ 12.42 – $15.00	Sep. 30, 2014 $ 15.01 – $25.00	Sep. 30, 2014 $ 25.01 – $35.00	Sep. 30, 2014 $ 35.01 – $47.80	Sep. 30, 2014 Stock Options	Sep. 30, 2014 Stock Options $ 12.42 – $15.00	Sep. 30, 2014 Stock Options $ 15.01 – $25.00	Sep. 30, 2014 Stock Options $ 25.01 – $35.00	Sep. 30, 2014 Stock Options $ 35.01 – $47.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)			$ 12.42	$ 15.01	$ 25.01	$ 35.01
Exercise price range, upper limit (in dollars per share)			$ 15.00	$ 25.00	$ 35.00	$ 47.80
Options Outstanding - Number Outstanding at end of period (in shares)							3,894,668	1,057,821	1,523,112	884,470	429,265
Options Outstanding - Weighted Average Remaining Contractual Life							5 years 1 month 13 days	8 years 0 months 13 days	4 years 7 months 13 days	4 years 8 months 13 days	0 years 8 months 13 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 23.10	$ 23.86					$ 23.10	$ 13.92	$ 22.45	$ 25.73	$ 42.61
Options Exercisable - Number Exercisable At end of period (in shares)							3,152,241	437,501	1,403,441	882,034	429,265
Options Exercisable - Weighted Average Exercise Price (in dollars per share)							$ 24.86	$ 13.79	$ 22.36	$ 25.71	$ 42.61