IncomeTaxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
United States federal [Member]
Summary of tax credit carryforwards
Amount of tax credit carryforwards	$ 86,770
Expiration date of tax credit carryforwards	from 2012 through 2031
California State [Member]
Summary of tax credit carryforwards
Amount of tax credit carryforwards	34,590
Expiration date of tax credit carryforwards	do not expire until utilized
States other than California [Member]
Summary of tax credit carryforwards
Amount of tax credit carryforwards	8,986
Expiration date of tax credit carryforwards	from 2012 through 2025
Foreign Jurisdiction [Member]
Summary of tax credit carryforwards
Amount of tax credit carryforwards	$ 6,175
Expiration date of tax credit carryforwards	do not expire until utilized