Organization and Summary of Significant Accounting Policies Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended								12 Months Ended			24 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2009
Accounting Policies [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax												$ 2,700,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax												1,000,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net									0	3,331,000	0
Comprehensive income (loss)
Net income (loss)	6,818,000	6,744,000	3,650,000	(6,035,000)	(5,992,000)	(2,580,000)	(10,142,000)	(14,547,000)	11,177,000	(33,261,000)	(23,215,000)
Other comprehensive loss: unrealized losses on securities									0	0	(448,000)
Impact of impairment of investments charge									0	1,693,000	0
Comprehensive income (loss)									$ 11,177,000	$ (31,568,000)	$ (23,663,000)