Shareholders' Equity Transactions Options Activity (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	May 16, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,771,000		$ 1,414,000	$ 2,470,000		$ 2,574,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period				4,533,782
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures				8,977
Excercised				(8,810)
Canceled				(179,241)
Options outstanding at end of period	4,354,708			4,354,708
Granted Weighted Average Exercise Price				$ 16.71
Options outstanding at beginning of period Weighted Average Exercise Price				$ 23.86
Excercised Weighted Average Exercise Price				$ 0
Canceled Weighted Average Exercise Price				$ 19.98
Options outstanding at end of period Weighted Average Exercise Price	$ 24.02			$ 24.02
Options exercise price range at end of period, Lower Limit				$ 12.42
Options exercise price range at end of period, Upper Limit				$ 47.80
Options exercisable at end of period	3,095,001			3,095,001
Options available for grant at end of period							4,460,337
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense				1,356,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options available for grant at end of period	3,622,692	[1]		3,622,692	[1]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense				$ 867,000
Share Based Compensation Arrangement By Share Based Payment Award Net Restricted Stock Award Activity				387,068
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				193,534

[1] *Shares available for grant as of June 30, 2014 reduced by net restricted stock and restricted stock unit award and performance share and performance share unit award activity of 387,068 shares and 440,600