Shareholders' Equity Transactions Options Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period Weighted Average Exercise Price	$ 26.21
Options outstanding at beginning of period	4,664,634
Granted	747,450
Granted Weighted Average Exercise Price	$ 14.49
Excercised	0
Excercised Weighted Average Exercise Price	$ 0
Canceled	(147,141)
Canceled Weighted Average Exercise Price	$ 21.69
Options outstanding at end of period	5,264,943
Options outstanding at end of period Weighted Average Exercise Price	$ 24.68
Options exercise price range at end of period, Lower Limit	$ 13.37
Options exercise price range at end of period, Upper Limit	$ 47.80
Options exercisable at end of period	3,044,920
Options available for grant at end of period	6,800,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options available for grant at end of period	517,410	[1]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Net Restricted Stock Award Activity	795,351
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	114,700

[1] *Options available for grant as of March 31, 2013 reduced by net restricted stock award activity of 795,351.