Stockholders' Equity and Employee Stock Option Plans Stock Award Activity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Award Activity [Abstract]
Number of Shares Available for Grant, Opening Balance	13,047,736	11,420,522	9,983,699
Options and SARS, Outstanding, Number, opening balance	3,103,472	4,275,648	5,928,776
Options and SARS, Outstanding opening balance, Weighted Average Exercise Price,	$ 8.71	$ 8.55	$ 8.45
Number Of Shares Available For Grant, Options ans SARS Granted	(1,883,388)	(313,750)	(342,900)
Options and SARS, Grants in Period	1,883,388	313,750	342,900
Options and SARS, Grants in Period, Weighted Average Exercise Price	$ 3.21	$ 8.26	$ 7.68
Number of shares available for grant, RSU granted	(700,987)	(1,381,070)	(1,628,183)
Number Of Shares Available For Grant, Options and SARS Canceled	1,047,545	981,365	348,913
Options and SARS, Forfeitures in Period	(1,047,545)	(981,365)	(348,913)
Options and SARS, Forfeitures in Period, Weighted Average Exercise Price	$ 8.73	$ 8.64	$ 10.42
Number of shares available for grant, RSU canceled	315,817	480,571	168,298
Options and SARS, Exercises in Period, Shares	0	(504,561)	(1,647,115)
Options and SARS, Exercises in Period, Weighted Average Exercise Price	$ 0	$ 7.15	$ 7.61
Unissued shares returned to plan	0	190,406	1,260,465
1998 Directors Plan shares expired	(60,000)	(10,000)	(10,000)
Number of Additional Shares Authorized	1,700,859	1,679,692	1,640,230
Number of Shares Available for Grant, Ending Balance	13,467,582	13,047,736	11,420,522
Options and SARS, Outstanding, Number, Closing balance	3,939,315	3,103,472	4,275,648
Options and SARS, Outstanding ending balance, Weighted Average Exercise Price	$ 6.08	$ 8.71	$ 8.55
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Options, Exercises in Period, Total Intrinsic Value	$ 0	$ 1.2	$ 2.8