Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Operations [Abstract]
General and administrative expense	$ 5,100	$ 4,256	$ 15,554	$ 13,999
Operating loss	(5,100)	(4,256)	(15,554)	(13,999)
Other income (loss), net	(324)	8,144	(1,391)	11,255
Interest income	278	180	969	516
Interest expense	(1,445)	(1,674)	(4,522)	(4,061)
Equity income (loss)	28,922	(1,798)	155,634	(12,243)
Net income (loss) before income taxes	22,331	596	135,136	(18,532)
Income tax expense (benefit)
Net income (loss)	$ 22,331	$ 596	$ 135,136	$ (18,532)
Net income (loss) per share:
Basic	$ 1.07	$ 0.03	$ 6.52	$ (0.90)
Diluted	$ 0.98	$ 0.03	$ 5.68	$ (0.90)
Average shares used in computing income (loss) per share:
Basic	20,790	20,583	20,737	20,502
Diluted	24,291	21,403	24,573	20,502